Mattress Categories

Mattress Brands

Extras

Get The Best April 2024 Mattress Deals!
Unlock Today's Coupons

Mlily vs. Serta

Slumber Search is supported by readers. Some links on Slumber Search are referral links. If you use one of these and buy something, Slumber Search may make a small amount of money. More info.

Mlily

MLILY® is a global mattress brand that is well known for being a partner of Manchester United Football Club, and is available at local mattress retailers across the USA and on Amazon. Some of their mattresses feature trendy materials like bamboo charcoal and CBD infused fabric, which is a major differentiator vs many other online options. They blend these materials with foam focused mattresses with and without coils.

Serta

Serta offers foam and coil mattresses and are common at many mattress stores and big box retail locations. As a household name in the mattress industry, Serta has been in the mattress business for a long time. Their mattresses range from budget-friendly to higher in price and offer a variety of firmness options and cooling designs. While most customers find Serta's branded products to be initially comfortable, there are some concerns about durability for some sleepers.

Based on our aggregated reviews and our scoring method, we recommend Mlily in this match up!

See Our Full Review of Mlily

See Our Top Mattress Choices

Mattress Score

Overall Score:
Mlily: 8.1/10
Serta Perfect Sleeper: 7.2/10

Customer Satisfaction:
Mlily: 8/10
Serta Perfect Sleeper: 7.2/10

Price Value:
Mlily: 7.9/10
Serta Perfect Sleeper: 7.1/10

No Back Pain:
Mlily: 8/10
Serta Perfect Sleeper: 8.2/10

Price:
Mlily: $899-$5500
Serta Perfect Sleeper: $349-$4599

Mlily:
Get Yours Now

Serta Perfect Sleeper:
Get Yours Now


Mlily's Owner Satisfaction

Some customers are happy with their mattresses, but others are not as happy and have had complaints about comfort. Despite those that are happy with their selection, this brand has lower satisfaction scores than average. If you are considering one of these mattresses, make sure to read on for more information.


Mlily's Supportiveness

Some folks feel good with the support in these mattresses, but some have had issues with support over the long term. For those that are heavier or require more support because of achy backs, read the reviews to make sure the mattress works with your body.

Edge Support
The customers have mixed thoughts about edge support on these mattresses. Some feel positive about the mattress supportiveness across the surface, but others had issues with supportive comfort and changes in support.


Mlily's Durability

Customers find that durability is one of the most important attributes to finding a mattress. We all wish our mattress will last a decade or more and still provide us with cozy comfort. Sadly, not all sleepers agree that these mattresses are durable, and some have had issues with longevity after a short time. If you are considering buying for nightly use, read the reviews to make sure that it will match your body type before buying.

Serta's Owner Satisfaction

Customer reviews can be difficult to get at and even harder to understand -- especially with brands trying at all costs to protect their reputation. Sleepers, sadly, don't always feel comfortable from these mattresses. There are still customers that are happy with their mattresses, but others that are not as pleased. Get more details on the specifics and hear from customers below.


Serta's Supportiveness

Support isn't exactly the same as firmness. Deep support means the mattress aligns the back and spine. Overall, these mattresses have some negative reviews when it comes to support. Most find that they provide a good amount of support at the beginning, but some customers described feeling less supported as time went on.

Edge Support
For those with mobility concerns or like to lay close to the side of the mattress, edge support is very important. For most, these mattresses do a good job with edge support, but some may find that it changes over time.


Serta's Durability

Finding a long lasting mattress is great, but it's not always that easy. These mattresses are reported by customers to be not as durable as others. That said, some sleepers may discover their mattresses lasts more than a decade, while other mattresses may break down faster. If you are heavier in body type, you may want to do extra looking before buying.

Browse Mlily Customer Reviews

[Bliss] Best Gift I ever gave myself!
I have a MLily Bliss King Size Mattress and it's the BEST mattress I've ever slept on! For the first time in YEARS I am sleeping through the night and I don't wake up with aches and pains! It also doesn't make you hot! LOVE THAT! You can't pay enough money for how a great night sleep makes you feel in the morning! So thankful I have my MLily Bliss!

Show More Reviews Show Less Reviews

[Bliss] Incredible deal.
I bought this mattress its by far the most comfortable mattress I have ever owned. I previously owned a tempurpedic mattress and it use to always make me hot, I had had back problems for years until getting one, and within 2 days of sleeping on it, they went away. The cover on the mattress feels great, this was a fantastic deal and I'm thrilled.

[Bliss] Love it
Best mattress I have ever owned. Good support yet soft and comfortable. My wife and I are now spoiled as we cannot sleep on motel mattresses

[Bliss] It feels like luxury at first
It feels like luxury at first. I've owned a queen size for about a month now. I have woke up almost every night with severe sciatic and mid back pain. It's way to soft and offers no support.

[Bliss] I purchased this mattress in queen size.
I purchased this months 4 months ago. It has the cooling gel in it, but I wake up with night sweats and hot., I also started to develop an allergy to it, I sleep on my back, it causes me to itch like crazy, and doesn't stop. I had to buy a mattress topper 3'' thick to put on top of it to keep away from the memory foam, even with a mattress protector on it. Helped some, but now I am stuck with it. It is however very soft and comfortable. Pity about the heat and itching though. I upgraded to this from a Serta memory foam without cooling gel, and I should have kept it.

[Bliss] One Star
Without a doubt the WORST investment in a mattress I have ever made. One star is six too many.

[Energize] A BIG THANK YOU!
Thank you Elliot & friend for personally coming to my house to drop off my mattress the next day after purchasing! Couldnt be happier! THANK YOU! - Christy W

[Energize] Comfy but on the warm side
This is the second Mlily mattress I have purchased in the last two years. I love my original one though you have to spin them around every other month or so because they really do form to your body...They also tend to be a little warm, I live in Ohio and rarely used more than a sheet all winter long, with my house set to 62 (62 is totally not low because my house keeps the heat in so it feels warmer for those of you that think I might possibly be a penguin). This mattress I bought for a friend of mine and it's just as comfy as mine. The off gas usually goes away within 24 hours and for some reason I tend to believe this mattress has less off gas than mine. So the sole reason for not giving it a 5 star is because I sleep hot and it isn't the coolest bed I've slept in, but it's uber comfy.

[Energize] Great mattress for a great price
I bought one of these two years ago, paid about 750 for it and in my opinion, I got a heck of a deal. The bed is super comfortable and is comparable to other more expensive mattresses. I spin it about every six months or so and bc its a coil/foam hybrid, it's kept its shape nicely. Everyone who has slept a night in this bed says it's one of the better sleeps they've had. I recommend it.

[Harmony] 5-10 of these vs. a Sleep Number or Temperpedic - no brainier!
So far so awesome. I'm a big guy with a serious accumulation of orthopedic issues. Used this to replace a twelve year old top of the line Sealy king size that was keeping both my wife and I up tossing and turning all night. Tried this in a showroom and I was so relaxed in five minutes I almost couldn't get up. It does sleep warmer than a conventional mattress, no doubt about it, BUT, it's a whole lot cooler than the old1st generation foams ( which I found intolerably hot). Super simple pakage shipping makes it a whole lot simpler to handle than a conventional, and we experienced very little if any issues with degassing odors or the foam reaching it's advertised thickness. Due to space issues our two new mattresses were unwrapped and left to reshape standing on their side, which may have actually helped, given the greater surface area exposure and reduced resistance that that orientation allowed. We've now had them (a pair of long twins) for several months and my 110 lb. wife found it too firm, so we replaced hers with something better suited to the princess and the pea and gave hers to our son, and he loves it. We'll see how well it holds up over time, but considering the difference in cost I could replace this every 3-4 years for what we spent on the last Sealy. We did also try probably two dozen similar offerings from the major names and the fanciest Sealy foam mattress was the only one we found that we liked as much or better, just not several thousand dollars better. I consider this proof that you don't have to sell a kidney to get decent night's sleep. Just hope it lasts. We also purchased a pair of the adjustable bed frames with the wired remotes (Pragma) and are equally impressed with them in terms of function and value. The wired remotes are actually a blessing in disguise for folks like me who are constantly losing one. The only caveat is that the twins tend to slide apart on their frames, so I'm working on addressing that (maybe Velcro or a retainer such as is used on the foot of the bed) but overall sleeping better than I have in years.

[Harmony] Three years in...still saving my back
My wife and I have had this mattress for 3 years now, and it's still great. There is a little bit of a break in now, but it's still very comfortable and not too soft. It doesn't feel like a hammock as a spring mattress would, and it's actually still medium firm. I have back problems, namely lower back spasms, and this has helped me greatly. It works for back and side sleepers (myself) and stomach sleepers (my wife).

[Harmony] Firm and perfect
I actually bought this from a local vendor in my area. For years I have favored what my family lovingly calls an 'iron slab' for a mattress. I'm a firm supporter of a firm mattress. However, as I get older I got more aches and pains to go with my years and a hard as rock mattress is no longer ideal. But I didn't really want a cloud to sleep on. I cannot remember how I got turned on to memory foam mattresses, but after exhaustive research I surmised which one would be the best, this one wasn't even on my radar. Before buying the one I had selected online, I wanted to test out some memory foam mattresses in the store to make sure that it was possible for them to be comfortable and yet firm enough that I wasn't sinking into them. I went to 5 stores locally, 4 of the stores encouraged me to look at a Sealy, however, the vendor I had gotten my previous mattress from showed me the M Lily. I fell in love with the Lily, but I'm a cautious buyer, so I went home and did some research, and liked what I found. So I bought it two days later. I have had this mattress now for a week and I love it. I won't say that it wasn't an adjustment coming off of a spring mattress, because it was. This mattress is firm, I tried to punch it and it actually hurt my fist. However, the human body is heavy and this mattress will sink a little on the areas where you put the most pressure, namely your butt. LOL. And if you stay in one area for long and warm up I have noticed that the mattress foam seems to get almost 'gooey', however, move from that spot and everything goes back to the way it was. I love the quilted cover, I loved it so much I actually didn't put a fitted sheet on the mattress for the first 5 days. The top layer of foam is some sort of cool gel formula and you can feel it if you run your hand over the quilted top. Altogether, if you like a firm spring mattress than I would recommend this mattress for you.

[Harmony] I've literally been in it all night and day it's awesome I weigh close to 300 lbs my wife doesn't ...
Just bought one of these here in town. I've literally been in it all night and day it's awesome I weigh close to 300 lbs my wife doesn't feel me get in and out of bed it cushions my weight it's just a great mattress. Even our lil boston terrier loves it lol. Only thing I suggest is make sure buying online like this that you don't lose the 10 year warranty it's great for piece of mind

[Harmony] Second time to purchase....win, win!
I bought my daughter this mattress a couple years ago. She loves is so much, I just bought another for my son. He is sleeping very well and loves it, too.

[Harmony] It offers great support while molding to your body and relieving pressure ...
had back pain, headache and tired all the time, and all of it is fixed with this mattress. It offers great support while molding to your body and relieving pressure points. I weigh 240 lbs. Lets hope it lasts a long time

[Harmony] love this mattress
We just bought this mattress about a week ago and we absolutely love it! I was afraid of buying a mattress online so we went to our local furniture store where they had one of these for us to test out. Loved it, bought it, no regrets. It's not too soft not too firm. My husband doesn't like soft beds and I don't like firm beds but we both agree this is the best mattress ever. Also very afordable for what you get.

[Harmony] Bad warranty fast deformation.
Bed will not last more than a couple years. Mattress will deform under your body weight until it is virtually impossible to stay on bed. Warranty is a scam. They will not honor the integrity of the mattress.

[Premier] The futon was so hard it was like sleeping on a stone floor
We were replacing a futon mattress on a day bed in our office/spare room. The futon was so hard it was like sleeping on a stone floor. The new mattress is perfect for me to sleep on when my partner has the flu etc. It has enough support but is similar to our memory foam mattress. When we unpacked it there was a slight smell as it aired but it was minimal and went away quickly. I'm quite happy with this mattress. It's perfect for my day bed. Other reviews have commented on how it bears up over time, obviously I can't speak to that concern.

[Premier] worth the price
7'' size is very comfortable: supportive yet soft. Makes my sleeper chair very accommodating, especially for older guests. Arrived quickly; packing odors dissipated within 24 hours.

[Premier] Five Stars
Excellent product and great delivery service for a bulky product

[Serenity] Good, but not great.
We had purchased two 10'' Mlily mattresses for our vacation and everyone raves about them. So, when it was time to invest in a mattress for our main home, we thought we'd do the same. After reading dozens of reviews, we went with the 13'' Serenity pillow top model. The first night seemed like a dream. After the first night, my wife and I have experienced nagging lower back pain that can only be caused by the mattress. We are hoping that the mattress softens a bit with time, but so far we are less than completely happy.

[Serenity] Sleeping on cloud
Love it it's like sleeping on a cloud best purchase I've made so far

[Serenity] Five Stars
A great mattress, finally found the one!

[Serenity] VERY glad we went this route
Very impressed. Had reservations buying a cheaper brand as opposed to Tempurpedic, but the cost savings made it worth the gamble. We've had it for a month now. VERY glad we went this route. The bed is comfortable, sucking you in yet still firm. And the cost savings makes it even more worth it. I would recommend this bed.

[Serenity] excellent
It's high quality and makes spring mattresses seems like something dinosaurs would sleep on. If you can imagine being on a distant planet in anothe galaxy sleeping like a boss, this bed is what you'd be sleeping on. Seriously though, it's very supportive yet very comfortable. Stains easy but the lady who sold it to me said any foam mattress needs a waterproof cover. Why the cover isn't washable on this model is anyone's guess. Maybe the makers of the bed thought the buyers for these things were going to be single people that happen to be extremely careful about not having wine in bed...Also, yes, as the other review states, it is very comparable to the mattress at Ashley furniture and such. Maybe more comfy.

[Serenity] The most comfortable mattress I've ever had the privilege of lying on
Heavenly. The most comfortable mattress I've ever had the privilege of lying on. I replaced my $3k Tempurpedic with the MLily and have slept much better.

[Tranquility] Wonderful!!!!!!
I must admit I never would have imagined I would buy a mattress on the Internet without even trying it out first. Well we took a chance, and the whole experience has far surpassed my expectations. My husband and I were disappointed with our local store who carries Mlily. We went there and I liked the Bliss mattress and he thought it was too soft. So we tried out the Energize model and it was too firm for me. So while looking at the Mlily catalog they gave us, we both liked the tranquility mattress and thought that would be a good choice for us. Hybrid , middle of the road firmness, cooling feature and it was one of their higher end models as well as being featured on the cover of the Mlily catalog. Well our local store told us this Tranquility mattress was not available here and was mostly sold in Europe! Really??? Well I immediately looked it up online and found it on here for close to 500 dollars less than the bliss model at the store, with free shipping!!! Now...about the mattress...... It is absolutely wonderful!!! It arrived within 3 days of ordering it and came rolled up nicely in a blue tarp to protect it. We opened it and let it expand for 24 hours.... now keep in mind: I was sleeping on a 19 year old innerspring mattress and I was used to it being very soft, and having the roll to the middle and sink feature lol! Anyway at first I thought it was a bit firm for me, but I have been sleeping on this for almost 2 months and it has softened up just a little and I have been sleeping soundly throughout the night! Its firm but soft if that makes sense. I absolutely love this mattress and would highly recommend it!!! You have lots of support but when you lay down, it conforms to your body without sinking and it just feels dreamy!!! I feel more rested the next day and don't wake up 6 or 7 times throughout the night like I did on our old mattress. The seller we got it from was wonderful too! He went above and beyond to make sure some details were ironed out and helped with us choosing a new foundation for this mattress. We tried out several mattresses locally which were in the 3000 dollar range and this mattress feels just as good if not better than those. I highly recommend this mattress as my husband I have both recieved many positive ramifications as a result of purchasing this mattress:)

[Tranquility] Love it.
We stayed in a hotel suite that had this mattress. We loved it so much we bought one on amazon and it is exceeding our expectations. Love the gel that helps keep the bed feeling cool. The memory foam has great support and doesn't give you the 'sinking' feeling. It conforms to your body very nicely with comfortable support, it doesn't swallow you up. Overall we love this mattress, couldn't be happier.

[Tranquility] Didn't Last
We have had this mattress for two years. It started off great but not so good now. I wake up around 3:00 am now with my back hurting. The mattress top has gotten loose with the material pooching up. The support is just not there any more. Have slept on other beds (hotels, visiting family, etc) and I sleep well with no back pain. So now I have to put out another chunk of money for another mattress - not an easy thing to do with our income.

[Vitality] Great Bed
Never had any complaints for this bed. Very comfortable and at a great value. Do not pay over 800 for a queen size, otherwise you are getting majorly ripped off.

[Vitality] Worst Choice I Ever Made
I have only had this bed for under 30 days but I am so sad I spent $2700 on it. I told the sales person I wanted a bed similar to my ICloud Tempurpedic. I was told this is better than the ICloud. Well, I feel like I am laying in a coffin. The bed sags so bad in the middle and to get out of it is like climbing Mount Everest. I do not have this kind of money to be spending on a mattress. Am so so sad I purchased this product. I would not even sell it to anyone but just take it to the dump.

Was decieved
I have had 6 back surgeries getting ready for #7 ,when I contacted the company about a problem with the mattress that I paid $1200 for in April I was told to dismantle and lay everything on the floor and lay a broomstick on it and take pictures of it, I tried this and was layed up for 4 days on a mattress that hurts my back, thank you very much I guess I am stuck with it so when I can I will buy another one, mostly upset about being deceived about warranty and comfort level thank you and very happy I will never have to deal with this company again

These are the best beds around
We have bought 2 beds from Mlily and they are the best beds. We also have bought several pillows and they do not go flat like your normal pillows. I would highly recommend there beds and pillows to anyone. I have back problems and since we have bought our bed I don't wake up in pain like I use to.

Great mattress
The first time I laid down on my MLILY queen mattress, I knew it was the best. A year later it still is. It is quality and comfort.

Avoid Mlily
Recently purchased an Mlily at a fairly expensive price, after receiving it and getting it on the bed, it was impossible to sleep on.TOO HARD,like sleeping on a concrete floor, the place we bought it from says oh just give it time.well we gave it time and then some more time. So we went back to where we purchased the mattress,and all they would say is that Mlily does not have a comfort guarentee.. So after giving it another month and not hearing it back from the store where we purchased it. The mlily went to the dump this morning. We never heard back from the store or the company.. Pretty sorry. Every friend i have will know to avoid mlily...Terry SheltonJackson Tn.

Best Mattress Ever for the Cost
Made my purchase for the King 13" Semi Firm and I've had the best sleep ever... Would make sure that I ordered the cooling Pillows also. Do not have the model numbers for my items but I am very HAPPY with MY PURCHASE... Thanks, Tammy

terrible
i purchased this mattress from spiller furniture in columbus ms. when the mattress was delivered i noticed that it didnt look the same as the one i had decided on in the store. when i sat on the side of the mattress in about 3 seconds i would have ended up on the floor if i hadnt caught myself. spiller refuses to do anything about it and mlily has had me jumping through hoops taking pictures and getting no where. Bottom line is i am out 1300 dollars for a mattress that i cant sleep on. So wheather or not this is the mattress i saw in the store or not they both are mlily mattresses.

Hidden fraudulent charge
I ordered2 bunk matresses from WALMART from this company. WALMART said free delivery. Total bill before taxes 303.00. I was charged 62.00 in TAXES which is 22% which did not exist. Mlily said its recycle charge. Im not recycling. So why show on bill as tax? I want a refund of 42.00.

Not what I paid for
I paid more than this mattress was worth. It is hard and hot and does not sleep well. The salesman convinced me that the mattress was great and would sleep well. I am so unhappy with MLily. I feel I wasted my money.

expensive piece of back pain
I purchased this mattress 2 months ago for two main reasons that I run hot at night and have shoulder pain. The mattress did help my shoulder pain but now I wake up with back pain because of the poor lumbar support. You don't notice the poor lumbar support in store because you lay on it for maybe 10-15 mins. Also, with the mattress cover on you don't even notice much of any cooling provided by the mattress. The edge support is horrible. I would stay away from this mattress it will save you a fortune~ 1700 $ for a foam mattress. While other brands selling a mattress for ~1700 $ have a trial period this company doesn't offer that , so you are stuck with this rip off foam mattress. The company website doesn't even let you write a honest review.

Browse Serta Customer Reviews

Really nice when warm. Hard as a brick when cold.
Have a cabin where the bed room temp is around 60 in the winter. The upper 3 inches of gel memory foam is really ridgid when cold. Climb into a cold bed is more like climbing onto a piece of plywood. After about 10 minutes, your body temp softens the foam and it is really comfortable... until you roll over too far onto a cold slab and you are back on the plywood.

I sure hope summer is more comfy.

Show More Reviews Show Less Reviews

The Best Mattress!
This is a great mattress! My husband and I moved to our new house and bought this mattress for our room. The first bed that came did not open up all the way and was basically a taco. We called Amazon and they sent a replacement. We have been sleeping on this bed for about 3 months now and we can feel the difference from the traditional mattress we had prior. Our sleep is a lot better, we no longer feel sore, and we don't notice each other's movement during the night. Definitely get this mattress!

Firm enough for a big man like me!
I weigh a lot in comparison to other people so I was initially hesitant to buy a memory foam mattress as I feared sinking to the bottom or drowning. This mattress not only held my weight stiffly but it is super comfortable and probably the best mattress I have ever used. I bought the double and it worked so well that when I bought a king bedroom set I decided to buy the bigger exact same mattress in king size. It come in a big box compressed so you will want to get it upstairs on the bedframe before you open it up and let it absorb all the air around.

Great Buy!
I was uncertain about purchasing a mattress on-line, but the price was so much below what I found in stores that I went ahead and made the purchase. I'm glad I did. The shipping was easy, the mattress quickly expanded once in place. I did not notice any odor. I'm sleeping much better through the night and wake with less back/hip pain. This mattress is a great buy, especially for the price!

Amazing
My wife and I were looking to upgrade our bed to a king during a recent move. We looked at all the big named stores for furniture / mattress and were taken back by the price of the memory foam mattress. We tried out the I-comfort mattress Raymour and Flanagan's and really liked it. After spending hours researching this mattress, I came to the conclusion that this is similar to the Serta I-comfort and about 1/4 - 1/3 of the price. This bed is exactly as advertised and feels identical the the I-comfort we tried in the store. We could not be happier and it sleeps so much better than a traditional spring mattress. I would recommend to anyone.

Remember, you also need a box spring or foundation. This will add another $200 - $400 for the total cost of the bed.

A most fantastic mattress
Our new mattress is comfortable beyond words and so much lighter than the Tempurapedic we had before for many years. It feels like a heavenly cloud and we have slept so well on it and could not be more pleased with our purchase. The price of it is unbelievably low, I recall we paid $2,000.00 for our old mattress over 15 years ago.

Maria & Ted Phillips

I snore less.
One of the best beds I have slept on. I usually sleep HOT and was leary of trying the memory foam bed, but i was amazed at how cool it sleeps. My wife has also said that I do not snore as much.
I could not give the bed a 5 for one reason. I like to sit on the edge of the bed and put on my shoes, but this bed does not have the support on the edges to do that.

Hard, hot, and bumpy
I've had this mattress for 3 weeks now and I am not happy. It is very firm for a memory foam mattress (maybe it will soften up over time), so firm that my body doesn't sink far enough to fill in the lumbar space of my back. I wake up sore every morning, and it reminds me of sleeping on the ground (I camp a lot, so I know). It was shipped in a shrink wrapped container, folded in half, so there is still a noticeable ridge down the center of the bed that divides the two halves. Also, even after airing it out for a week, it does still have a noticeable plastic smell. Lastly, it does trap a heat a little bit.

Overall, I am really unsatisfied, and am contemplating returning it.

Very good mattress
I have had this mattress for a year. The mattress is very good. I read a ton of reviews before purchasing this mattress. A lot of mixed reviews when I researched this mattress. I could not see spending 1500 to 3000 dollars for a similar mattress. I was a little skeptical because this mattress was so cheap. Amazon Prime was a factor in purchasing this mattress. The mattress is very good. No issues with smell or sagging. I am very happy

Hard as a rock
Wow, what a disappointment. Sure wish I'd listened to the reviews that said this mattress was HARD. It's not just firm, it's like sleeping on a stone slab. I can't imagine the hassle to pack it up to return it, so after a week of suffering, we bought a 4-inch memory foam topper, which has helped tremendously. However, as soon as we can afford it, we're buying a real memory foam mattress.

Way to firm for Foam!!
If I had it to do all over again I wouldn't have bought this. It needs to be listed as an Firm mattress. Since I have it, I tolerate it. I went out and bought a 1inch foam topper to put on it to reduce the firmness. What I do find is as you sleep on it and it warms up it gets softer. So I bought a heated mattress pad and put it on also. About an hour before bed time I turn it on low and it does soften the mattress somewhat. Over all I would never recommend this mattress nor would I by it if I knew what I know about it now.

Great Sleep
We were a little worried to buy the bed online, but took the plunge. We were pleasantly surprise at how quick it was delivered. The queen size bed was heavy, but being boxed up made it easier to move. Once in the bed room, we unpacked it and let it return to its original shape. About two hours. The bed sleeps great. My wife and I both enjoy the fact that it adjust to our size. It does not wiggle when I get out of bed at night. I was expecting to sleep hot, but the cool gel works. Great purchase and great value. We priced similar beds at retail stores and they cost $1200. Very happy.

I love this mattress
I bought this mattress almost 2 years ago and I still love it.

That being said, I must disclose that I am somewhat cold-natured, so I don't mind that it retains heat, as the new memory foam mattresses do. This is the only reason this mattress gets 4 stars instead of 5.

When I purchased this mattress, I had done quite a bit of research on prices and quality of memory foam mattresses, and found this one to be one of the most economic choices for the quality. I am happy that I chose this one.

It arrived in a big square box. WARNING: Do NOT open the box until after you drag it upstairs and into the room where you want to use it. Opening the box in another room will create a lot of unnecessary work for you.

The instructions said it would take about 24 hours to completely assume its proper shape and size. In reality, it was ready just a few hours later.

My husband complained that it was not as soft as he liked, so we bought a memory foam/gel mattress cover for it at Costco. This helped make it softer and provided some relief for my husband from the heat retention.

If I had to buy another mattress, I would buy this one again.

Smart buy
The full size mattress is really comfortable. Bigger then a normal full size mattress. We had to replace the old boxspring to a sleep master smart base because of the size if the new Serta. Now we have more room under the bed for storage as well.

Great for sleeping, but quality a bit poor.
I was already to give this a 5 star rating. We bought it in june for our summer place. We have a temperpedic and home and never sleep well with out it. We could not justify the cost to buy one for the summer place. When we found this we were excited! The negative reviews sounded like the negative reviews for temper pedic, so we were not too worried. The box made it really easy to transport ourselves to our place. It opened and inflated great! We had all the windows open and fans going, but we never really noticed an odor. We even slept on it the first night!. It was close to the temper pedic sleep wise. Not quite as cloud like, a little harder, but it worked for us!

This weekend, I took off the waterproof cover that we purchased to wash it with the sheets. I found 4 places on the mattress where the seams were split and you could see the foam inside. Very dissapointing! We expected a little more from a Serta!

Love this mattress
Excellent mattress through and throughout..Amazon was super quick and mattress was in perfect shape..As I sleep on this mattress 2 yrs later all I can say is I sleep like a baby..It feels like you're sleeping on a cloud ..I wake up refreshed from a great night sleep day in and day out..

I'm lovin' it!
Researched loads of beds in my desperate attempt to get a good nights sleep and deep six the pillow top that was aggravating my already ailing lower back...........decided on the Serta icomfort since many people commented on how hot the memory foam gets.....and tried it out at my local store where they were upwards of $1600 depending on the depth. Arrived promptly, NO SMELL, easy set up and was sleeping in it that night....however my husbands initial comment before he had slept on it, was that it was like a slab of concrete.......... but once you're in it this is not the case... It is firm, yet neither too firm nor too soft and extremely comfortable altho it did take me 3-4 nights to get used to it having been sleeping on a pillow top, and I did find I had to adjust my mediflow pillow somewhat so it was flatter and lower...........the only down side I can see, is that both myself and my husband have been lingering in bed much later than normal, I used to be up at the crack of dawn since my back would be complaining and I needed to get up, but its oh so comfortable, and I'm loathe to get up when its so very snuggly and cosy....I'm sleeping much better with less tossing and turning due to pressure points.... if you're considering one, I'd say go for it, we both love it and were not dissapointed in any way!
**UPDATE** Oct. 2014 No sagging....best bed EVER!

Serta 12-Inch Gel Foam 3-Layer King Mattress
We received this mattress packed in its box and we took it to the bed and unboxed it accordingly to the instructions. Here is a short video of the process. [...] We then waited only a few hours, made the bed, and slept that night on it. Its been great this first week! Highly recommended and I will write another review after a few more weeks along with an updated video of it. It was awesome to see it take its shape! Thanks

Intelwalk

Great mattress. Unbeatable price.
Bought this mattress after trying out several different foam beds at various stores. Macy's had the Serta line of beds and I liked them much more than the others that were there. So I was very pleased to find the mattress on here.

I bought the full sized bed and it came in a box that's roughly 4' by 2' by 2'. The factory folds the mattress several times and then compresses it in a plastic wrapper. I put it on my existing box spring and opened it up and left it sit for about 6 hours for it to reach its full shape.

There was a slight smell to it but nothing unpleasant and by the time I put the mattress pad and sheets on it, I was sleeping on it the first night without any issue.

If this is your first foam bed it will take a few nights to a week to fully acclimate to the difference between this and a spring based bed, so dont give up on it too quickly.

I sleep on my back and side a lot and used to have horrible shoulder and hip pain from a conventional mattress and the pressure points. I am pleased to say this is entirely gone with this mattress.

I normally like a very soft squishy mattress and when you first sit or lay on this bed (especially if it's a bit cold) it's very firm. I laid on it and thought, "this will never work". Then it begins to conform to your body and supports you so well, you'll understand why so many people are switching to this type of bed.

With any foam bed, they hold a little more heat than a normal mattress. I havent had an issue with this one other than during the colder months I had to turn my electric blanket down than where it's normally set and I am fine. I would HIGHLY recommend this bed and at this price you just cant beat it.

Best mattress I have owned
I have had this mattress for over 3 years now and it is just like new. Would highly recommend if you are looking for a quality memory foam mattress at a great price. I have back problems and this has been wonderful.

This is a great mattress!
I was very skeptical when I ordered the product, and when the mattress was delivered in a 3 ft box and I pulled out the mattress folded over and shrink wrapped, I became even more anxious. When you first open the mattress and flatten it out, it will be hard as a rock. This is only because the gel becomes cold and needs time to reach room temperature. I let my mattress straighten out for around 5 hours, and by that time the mattress was completely flat and much softer. I wish the mattress was a little firmer, but all in all I am very happy with my purchase. The mattress is extremely comfortable and I love that the mattress retains my body heat, especially during the winter. If you're looking for a comfortable mattress at an affordable price, I highly recommend this mattress.

So far so good
You have to let this bed have a break in period. It was shipped in a little box and expanded very quickly. My husband built a platform out of wood for the bed. The product only had a smell for the first night or two but nothing like some of the reviews had mentioned. Now it did have a high spot for the first two weeks but after it began to break in things got better. I waited to review this poduct because I heard that these type of beds need to be broken in before you can have a real good nights sleep. We are both sleeping better. I love it even more because my husband wakes up earlier than me and I never ever feel him moving or getting up before me. I love that part. This was a good buy. I didn't give it a five becuse I am a hard grader.

Just Right
I ordered this bed in the offset chance that it would be comparable to the beds in the big chains (i.e. Macy's, Sears, Etc.). I was pleasantly surprised when it arrive on schedule and was set up and ready in minutes. There was no smell that a lot of other customers spoke of. It did have a slight crease for the first few days. However it has fallen and I assumed it was due to packing. I've only spent two nights on it as I'm not moved in yet, but it made for a comfortable sleep. Especially with my girlfriend. Having my arm under her pillow didn't come accompanied with the "dead arm" that happens on most mattresses. All in all it was a good experience and saved a new home owner a lot of money. Thanks!!

Just like the more expensive mattresses
We went to a department store to try out memory foam mattresses and got sticker shoch at the prices. We came home found this Serta on Amazon we ordered it right away. When it arrived we were very surprised to find that it feels like a nuch more expensive mattress. We are very happy with purchase of this mattress. Thanks so very much.

I am in love with my new mattress
I am in love with my new mattress. It's a whole lot firmer than my old one, but a whole lot more comfortable. I had the luxury of testing it at my parent's home first. I have already recommended it several times.

I like it, wife hates it
I purchased this mattress 6 months ago after trying out the Gel mattress in a local store. This mattress doesn't seem as soft as the one in the store. My wife liked it at first, but after a few weeks changed her mind. She now says it is the hardest mattress she has ever slept on, but she seems to sleep well. I have back problems, and I do think the mattress is hard but I also think it helps my back. The gel does help keep you cool, but the foam mattress does hold some heat.

Amazing mattress!
Greatest mattress I've ever slept on. I am about 205 lb and it hasn't had the denting problem other foam mattress suffer from even after a year of use. The gel also helps to keep it nice and cool during the summer months.

Also, there was no noticible smell when I opened it.

Love it!
I had read a lot of reviews before purchasing this mattress and I am so glad I did. It does take two people to set this mattress up, but easy to place, remove the package, and let it sit to expand. There was a slight odor of chemical, but it wasn't that bad. I opened the sliding door to let natural air in and seemed to be kind of gone by the evening. The bed was comfortable, firm, and felt very relaxed as soon as I laid in it. This was definitely a good purchase for the price!

For a great night's sleep.
This mattress is very comfortable - no pain from pressure points. It is quite firm but we use a fluffy mattress pad which makes it just right for us. The mattress is barely a month old but so far, we love it.

Amazon told me to wait and now i can't return this item.....NICE!!!!!!!
I purchased this bed and the first one came to me falling apart... The replacement one seemed to be ok... we set up the bed and it seemed to take it shape over the next 24 to 48 hours... it had a very high spot in the center on the fold that they put in it to box this item.... the high spot never went away... i spoke with a amazon rep. and the said that it should relax and lay flat... it has been almost a year am I'm still waiting for it to lay flat...i have to lay in the middle of the bed to cuddle with the wife!!! this don't make me happy... so it looks like I have to spend more money and get a new one...i just spoke with a Amazon rep. and he told me that the return window was only a few weeks from purchase... so i waited as asked and now i can't return this item...I to me seems like i was told to wait so that they didn't have to return this item!!!!! Amazon is usually good with things like this but per there request that i wait i loose out??? this just don't seem right in my eyes... i guess I'm out the 581.94 that i paid... YOU HAVE BEEN WARNED DON'T BUY!!!!!!

Gimmick product, period
I bought this in hopes of finally getting good night's sleep on a comfortable mattress. That didn't/hasn't happened. Hands down the dumbest purchased I've made off Amazon ever. This thing is HORRIBLE.
Main complaints:
*Stiff as a board.. No matter the temperature (they claim your body temperature will fix it as it heats up)
*Stinks of chemicals. Not sure what its made out of but WOW! Smells like I'm sleeping in an open can of paint.
*I weigh around 190lbs and I don't even make a dent in this thing. I don't sink in and it sure doesn't "form" around me.

Talking to a retail seller of these he told me more foam mattresses are returned than kept. The floor models are beat down versions of the real things so people can't feel the stiffness.

Gimmick product, period

Good company bad product.
This company is good but the mattress sucks. The first one we got we thought there was a defect because where we sleep there are large indentions but since they replace the mattress the same thing is happening .

If you buy this, don't plan on staying out of it for long.
If you buy this, don't plan on staying out of it for long. This mattress is so deliciously cozy that after the first night, I ordered one for my daughter as a birthday gift. No more legs cramps, neck pain from sleeping in the wrong position and the mattress doesn't heat up like the regular memory foam beds. SOOOO nice!

SERTA DOES NOT MAKE THIS MATTRESS. WARRANTY IS THROUGH OTHER MANUFACTURER. READ ISSUES BELOW
We purchased on 10/30/2011 and keep a protective mattress pad/cover and deep pocket fitted sheet on at all times. We paid $583 for a queen back them. We have just reported issues to Serta, who told us Sleep Innovations makes the mattress for them. Sleep Innovations are now Innocor Comfort out of New Jersey. We have to deal with them and not Serta. Wish I would of known that back then. The issues we are having is that the Gel Foam has shrunk 1.5 inches on the foot of the mattress and 1 inch on the one side, across the entire width and length of the mattress. In addition, the seams are coming apart and separating on the top of the mattress cover. Innocor emailed me a form to fill out and I have to send them a copy of the Amazon receipt and photos of the issues. We will see how the warranty comes into play and if they make good on a replacement or refund. Will keep everyone updated.

Not Bad for a Serta-ish Mattress
We had a spring mattress that was causing back problems, went to 100 stores and looked at the memory foam options, then decided to buy this one because it was less than half the price. The one caveat is - the mattress says it's Serta but it's not really. It's made by Sleep Innovations (who is not Serta). We talked to support about it when all the docs showed up in a Serta envelope but were labeled as Sleep Innovations and they seemed confused about it as well. Then we called Serta to ask about it and they said they sold the rights to Sleep Innovations to make the mattress and use their logo to help sell it. All very confusing and more complex than it needs to be - but at the end of the day, we like the mattress so far and it wasn't outrageously expensive. Now onto the actual mattress...

It's definitely pretty firm. I think we've had it long enough now that it's officially "broken in". We did add a topper to it to make it more comfortable. If you have a low bed platform, you'll probably want to buy a solid riser (unless you like doing an ab workout to get in an out of bed). So far, I'd say worth the money. Will come back and re-update in a few months.

4 years later and it's still wonderful
I waited to write a review ... and then I forgot about it. I bought the mattress in 2012 and today in 2016 it doesn't have dips or depressions where we sleep and is wonderfully comfortable. There are two things to consider about foam mattresses and it's a little confusing. 1) FIRMNESS - This is is ability of the mattress to support you body without sagging or forming depressions. This has to do with the density of the foam. That's why some reviewers talk about how heavy this mattress is - it's because it's so firm - and that's a good thing. It's why 4 years later the foam is still in good shape. 2) SOFTNESS - This is the Pillow Effect on the top of mattress that gives you comfort. This mattress is very Firm but not Soft on top. And that makes it feel a little "rock like" to some. If you like a lightly pillowed top I HIGHLY recommend a 2.5 inch gel mattress topper. (The one Costco sells is perfect). I know it seems like the whole mattress is now more expensive but too many other less expensive mattresses sag (are not firm enough) to hold up over the years, and that's false economy. Also trying to dispose of a heavy foam mattress is not fun. My husband and I think this mattress is wonderful.

Firm. Supportive. Not Plush.
We have been sleeping on foam mattresses for a long time and will never go back to springs. This mattress in particular has excellent support characteristics but if you are looking for a "plush" feel, you will need a topper. This is a firm mattress which supports the body. It is not a mattress you sink into like a cloud. Some will equate that firmness with being an uncomfortable mattress but really it is just for people who prefer firmness to plushness. Before you buy this one online, you should go to your local mattress store and ask to try their most firm mattress. You must lay on a foam mattress for more than a few seconds to give it time to adjust to your body. If the firm feels right, this will suit your needs. If you need plushness, keep shopping.

On a side note, another advantage to a foam mattress of this thickness is that you do not need a box spring. Whatever you put this on will be fine for a bed which means you can make a pretty cool artistic platform beds, or set it on a board or cinder blocks or whatever and as long as there is a flat surface directly under the mattress, the feel will be the same as if you used expensive box springs.

not for us
This gel foam mattress was really hard for me. I was 9 months pregnant when we got this mattress and I thought it would be good because it can help me get a good nigh rest by having a good support. Nope. I was wrong. It felt like I was sleeping on the floor. Every time I move it hurts. Plus it wasn't comfortable because it was hot. Don't know why since it's suppose to have a gel foam but I guess that doesn't work for me. If you prefer plush mattresses, this is not for you.

Comfortable
I've purchase memory foam toppers in the past and wound up very unhappy with them. I would sink in too much and wake up throughout the night just to turn over. I've had no problems with this and now realize there is a HUGE difference between toppers and a real memory foam mattress.

First off, this thing weighs a lot, nearly 100 lbs. If you don't have a strong man to help you with this, you will have trouble. UPS had to help me in the door with it on a dolly. It arrives in a box, contorted and airtight sealed. Unpacking was a two man job and we unpacked it right on the frame.

This mattress does not sink much when you lay on it and reminds me very much of quality mattresses of years past (prior to pillowtop.) No achy back from this mattress! The hardest thing we had was finding a proper platform for it. Wound up going with the Structures by Malouf HIGHRISE Folding Metal Bed Frame 14" High Bi-Fold Platform Bed Base, KING and didn't even need plywood or anything. We put the mattress straight onto it and this was an affordable option over a platform.

I will need a new twin mattress soon and I will definitely be getting one of these mattresses for that bed.

****UPDATE: Aug 14, 2012****
I now own two of these. After having owned the first one for quite a while, I felt the need to come back and clarify something.
Foam mattresses and toppers are hot to sleep on. I thought everyone knew this, but since they don't, I needed to let them know. If you are prone to being cold, you will like this mattress. If you are prone to being hot, you will hate this mattress and definitely wake up sweating.

GREAT MATTRESS
COULDN'T BE HAPPIER. I AM A SENIOR WITH SEVERAL ORTHOPEDIC ISSUES. BECAUSE OF PAIN IN MY HIP I WAS HAVING TO SLEEP ON THE COUCH, WHERE THE DEPRESSIONS BETWEEN SEAT CUSHIONS FIT MY CURVES. NOW I CAN SLEEP IN BED AND MY HIP DOES NOT HURT. I HAVN'T BEEN ABLE TO SAY THAT FOR 2 YEARS. SHOULDER PAIN ON THE SAME SIDE DID NOT RESPOND AS WELL BUT IT IS ALSO IMPROVED. SINCE I AM MENOPAUSAL, HEAT WAVES -NOT FLASHES- KEPT ME FROM TRYING THE ORIGINAL TEMPERPEDIC TYPE MATTRESSES, BUT THIS SERTA GEL FOAM MATTRESS DOES NOT TRAP THE HEAT, JUST LIKE THEY SAID. SINCE THERE WAS SOME DISCUSSION ABOUT SMELL, (AND A SERTA PILLOW I PURCHASED DID HAVE A STRONG ODOR FOR A FEW DAYS) I CHOSE TO OPEN THE MATTRESS IN ANOTHER ROOM. THIS WAS NOT NECESSARY, ODOR WAS VERY LOW. I HAD LAID IT ON A SHEET AND WE WERE ABLE TO MOVE IT EASILY TO THE OTHER ROOM. GREAT PRODUCT!!