***2 Year Update 4/21/19***Sorry I missed the update! Six months wasn't enough time to give this bed a proper review. The big question you probably have is would you buy it again? Yes.This has been our nighty sleeper since purchased. We rotated the bed every three months. The wife has been very very happy with the bed as a back sleeper. She praises the deep, relaxing sleep almost every day. Around the 6 month mark, as a side sleeper, I started to have deep pressure points on my hips. I would move around a little and be fine, but I could feel the residual pain later in the day. That's where I'm at. Meh.I've finally gotten to the point where I'm looking at another mattress in the next year. Wifey doesn't know this yet because she's super happy with the bed. I am too, but I want a better sleep. I miss the deep sleep I had the first few months.These beds are perfect for growing kids or a guest bedroom. That's why I say I would purchase another, because I will for that application.****I wanted to make sure I put some thought into this review as I was once just like you. I was on the fence about buying a bedfrom Amazon. If your reading this, good job trying to educate yourself on this purchase! There are THOUSANDS of positivereviews on this bed and as of 5/19/17 mine is one of them. I set a Google calander reminder to update this review 6 monthsfrom today.The wife and I purchased the Zinus 14" metal platform (no headboard) instead of using our old boxspring. We wanted to havethe extra bed available in case we had over night guests. The bed frame was easy enough to put together, I'm pretty sure itsonly 20 wing nuts and bolts. I took the additional step of brushing thread sealant on the bolts to reduce the possiblity of*squeeks* and vibration as other reviewers have suggested.Unboxing the mattress was pretty straight forward. I watched a few Youtube videos and I suggest you do the same. Carefullycut the tape on the cardboard box and dump out the big heavy white bag. The mattress itself is inside the white plastic bagthat you rip open once you have the bag on the frame. Repeat. Open once you have the bag on the frame. DO NOT CUT THE WHITEBAG, RIP IT ALONG THE SEAM! Align the mattress on the frame and remove the clear plastic bag. Once the bed is completelyremoved from the packaging, measure the mattress thickness, do another alignment, pull the corners up toward you if they arefolded under and start the clock.I purchased the bed set in early April and the temperature wasn't exactly warm. As other reviewers have done, I brought in asmall space heater to warm up the room. This seemed to help expand the foam faster and uniformly. After 2 hours the mattresswas about 8 inches and I went to work leaving this project until later in the evening. Upon returning home, I found the bedhad expanded to 11 1/2 inches! I was very tempted to sleep on the bed that night but my wife reminded me that I shouldn'truin our new bed....a total of 36 hours have gone by...The wife has agreed that the bed is now ready to sleep on! I measured the thickness of the bed in 4 different locations allof which were over 12 inches. I'd say our bed has expanded to 12 1/4 inches! There didn't seem to be any visible dips orlumps in the mattress.I'm 6'4" 235lbs side sleeper, wifey is 5'9" 130lbs back sleeper and both found the bed to be very comfortable. I did not findthe bed to be "marshmallow" soft, but more on the medium soft/firm level. Is this a complaint? Nope. If you've never slept ona memory foam mattress there is a bit of getting used to. It's not bad, the bed just doesn't react like a tradtionalboxspring would. I was shocked at how well my wife and I both slept that night. Yes, there are a few days to acclimateyourself to this bed so don't jump into it expecting the magic floating marshmallow unicorn will usher you off to the deepestsleep you ever had on the first rainbow star lit night of spring. Did I sleep incredibly well the first few nights? Youfriggen bet Mr. Lahey!Regarding heat... I read where others had to change how they layered the bed sheets/comforter and will agree with that. Whilethis bed is not HOT it is warm so you may have to rethink having 6 layers of bed sheets. I sleep hot, but once I rethought mybedding heat was no longer an issue.For people wondering how this bed handles adult fun play time I wouldn't worry. The wife and I made sure to diligently testthis aspect of mattress performance and are happy to report... neither of us really noticed a difference. Our only realcomplaint was more with the bed frame than the mattress. There are no grooves/slots/tabs to secure the mattress to the frameor vice versa. Hence, the bed can move if your really really into adult fun play time.I can say after a solid month of sleeping on this bed that it's amazing. I wake up rested, no hip pain, and groggy from themass amount of REM sleep I just experienced. Only time will tell how this mattress holds up. Right now, it fit the bill andour budget. I will update everyone in 6 months.I ordered this item on 1-27-2018 it arrived on 1-29-2018 with my prime membership. I opened and laid it out on top of a guest room bed to inflate. In 4 hours it appeared to be fully inflated. However packing info says wait 24-48 hours before using to allow proper time to inflate. I did however break down and climb on to see how it feels. I am on a pillow top mattress currently that is roughly 6-8 years old and has been causing me a lot of pain in my shoulder and hip as I am a side sleeper. Just laying on this bed for a few minutes its much firmer than my current bed, and so very comfortable. I will leave a more through review once I have actually slept in it for a few nights. I can say I am very excited. I plan to put it on my current box springs, and we will see how it goes. I was a bit disappointed to realize you cant flip the mattress only rotate it, which is what I have currently with my terrible pillow top . and I like to flip my mattresses every month. I will also state that when I unrolled it I was really worried about it forming its natural state as it had a lot of weird lumps from packing, but it has formed to a normal mattress already on a cursory view of it on my way out the door today. I will better inspect it when moving it to my actual bed. Update!! I have been sleeping on this mattress for about a week now. I will say one night I did get very warm, however I don't think it was my mattress I tend to run hot and cold and occasionally has the same issue with my old pillow top. This mattress is shockingly firm when you first sit or lay on it you think oh Hell No! But within second the memory foam begins to contour to your body and it's very comfortable. I am a side sleeper and was having alot of hip pain with my old mattress. While my pain isn't gone it's much better, and I think it will go away given more time with this new bed. My review is definitely a positive one. For 179$ and arriving in 2 days I'm very pleased. Included are 3 photos the last photo shows me sitting on the edge of the bed showing how much it goes down with my weight, and that I don't know why people say you can't sit on the sides I can't sit on any side any corner no issues... and even with my weight it springs right back to shape once I move or get up, it also still provides comfort and support this bed is rated up to 500lbs! Which thankfully I am not!********* Updated Review***********I have been sleeping on this bed for over a month now, and wanted to update my thoughts. My hip and shoulder were in ALOT of pain when I bought my new mattress. I couldn't barely walk around during the day from the pain, now I am fully recovered and I credit my bed for this. If you are on a budget and cant spend 500-1000$ on a new mattress I greatly recommend this item.If you are plus sized and worried about it don't be this bed is tested for 500lbs and as a big girl myself I sleep amazing on it with my HUGE dog and cat. I feel more rested and relaxed waking than I have in at least 5 years.Bought the 6 inch model for a spare bed at the cottage. After a week it expanded to 3 inches. Some areas were 4 or 5 inches. Lumpy. Uncomfortable. I read all the positive reviews and took a chance. Now Amazon wants me to return a mattress in the mail. Picture yourself doing that before buying.I bought this bed months ago but wanted to get a good amount of use before posting a review. Truth be told, I could have written one after one sleep because this is just as comfortable as it was the first night! Earlier this year I bought one of those fancy (read: way too expensive) Endy mattresses and HATED it. I returned it after three months and purchased this bed, mostly out of desperation because I didn’t have a mattress and this was way cheaper. It’s a dream. I feel like I’m sleeping on a hotel bed every night. I sleep alone and tend to sleep in the middle-ish and there’s zero sign of any sagging or dent. Mind you, I have a cooling thin pillow top on it because summers are super hot here/I sleep hot, but nearly all the credit goes to the mattress. I’ve recommended it to several friends and will keep recommending!Edit January 2022 (nearly 4 years after purchasing): IT'S STILL AMAZING.This is a really tough one.First off, I want to say that I myself am 110% satisfied with this mattress. I am 220 lbs and approximately 6ft tall man. With some budget mattresses a good night sleep can be hard since they usually do not offer very much support. The Zinus Memory Foam changed all of that. Now, when I lie on my side, my body gets contoured just enough to have great support and softness. So for me - it's an A+.My wife on the other hand is in her second trimester and feels that the mattress is too soft and is hurting her back. This poses a dilemma because it is actually extremely common for pregnant women to have back pain during pregnancy as their bodies adapt to the extra weight. I love her very much and would give up the Zinus in a heartbeat if I truly believed that the mattress was responsible. I have had many women explain to my wife that the back pain is normal so she agreed to give it some more time. My wife is the most amazing person I have ever met by the way.So for now - I am very very happy with the mattress. If things do not pan out with my wife, I will unfortunately have to return it. Zinus has a great return policy and they are extremely accommodating. If my wife decides to keep the mattress, I will append my review to 5 stars.The delivery arrived a day early which was awesome. My boyfriend and I just moved in together and we needed a cheap bed. I read the good and bad reviews so I was a bit nervous, but I’m glad I decided to try it out. It did have a pretty intense smell at first, but it wasn’t a bad smell. Just like chemically kind of. I left it to inflate and air out with a window open for two days and the smell is basically entirely gone. I slept on it for the first time last night and it’s comfortable, and an incredibly thick mattress. Definitely worth the price. I feel very elevated off the floor which I like. I would recommend this for anyone looking for a comfortable and cost friendly mattress.One Year of Use:I'm impressed with this mattress, it holds up well. Sometimes I need to use an inflatable pad but mostly it's held my weight well after a year (240lbs).Must use mattress encasement of some kindBUYER BEWARE:I was NOT aware that the inside of this mattress is filled with effing FIBERGLASS. DO NOT REMOVE THE COVER!!! If I had known about this, I would have chosen another brand, as you can imagine its not a returnable product.Zinus is VERY sketchy about mentioning this aspect of the product, there is a news story about a woman who had fiberglass all over her house from washing the cover. I am concerned over time the glass will permeate the cover regardless.