Just received this and have slept on it a couple of nights. It did take 48 hours to inflate completely. If you sit on the bed, it will sink where you're sitting, however if you lay down there hasn't been any sinking - it stays firm. Since it's only been a couple of days, it will be awhile to determine if it is as good as it seems to be. So far, we're very pleased with it.

The description of this Item was "Zinus Night Therapy 12" Green Tea Zest w/Smartbase Set, Size: King" However, no Smartbase was received and thus this item was not a "Set". That was a disappointment. However, the actual Zinus mattress has proven to be a complete delight and surprise. It came packaged, as all memory foam mattresses, tightly compressed and rolled inside a large box. It was left in the box for about 5 days before being unrolled and although the packaging indicated that it would take 24-48 hours to reach its full thickness, it probably reached 11 1/2" within a few hours. Now, after a few weeks, it has reached its full 12" height on all areas of the mattress except a slight dip in two corners that isn't really a concern. The mattress is surprisingly firm and I love it for that reason. Some people who prefer a softer sleep surface may find the mattress too firm. This mattress replaces a pillow-top mattress that, after only about 3 years was dipping on each side. I'm hopeful this Zinus mattress holds its firmness and shape over time!

Fantastic mattress. Fantastically thick mattress. Firm but gives enough to feel plush and comfortable. I was pleasantly surprised with the excellent quality as I had never purchased a mattress in a bag. What a pleasant surprise. Super glad I went with the 12” as it is very luxurious.

We bought this mattress for our 14 year old daughter a few weeks ago. She is loving it and hates getting out of bed in the morning because she is so comfortable. I have laid on it a couple times and it is pretty amazing, but can't speak to a several hour long night sleep. It decompressed perfectly and quickly. I would definitely buy another one.

I have never slept on a bed like this before but my husband had and he assured me that it would be good. I don't know how to explain this other then it's soft and firm at the same time. For me it took about a week to get used to the bed. Now it's pretty comfortable.

This is my first experience with a memory foam mattress and not sure I will be able to go back to a traditional spring mattress at this time. It comes in a box, which I didn't expect for starters and essentially vacuum sealed, which was great as it was delivered on the uncovered section of my porch on a rainy day, but the mattress stayed dry. It will definitely take more than one person to move around and the box indicates that. The mattress will take time to flatten out after you open it, but laying on it one night will take care of that. The first night it felt too firm for my liking, but it was new mattress experience for me. After the first night though, I am all in, it is firm, but not too firm and it doesn't make the same noise as a traditional mattress, which is nice because I am known to switch sides a lot. However, I have found myself not tossing and turning as much as normal either. This is a great mattress that I would recommend and at a very reasonable price to match.

bought this for 15 year old son along with a platform steel bed from sam's. Mattress came rolled up in a rectangular box which freaked us out a bit because we had never seen this done before. Plus, when we opened the box and unrolled the mattress, it was about 3 inches high. A note included said to let it rest 24-48 hours to allow it to grow to full size...It did just that. :) My son says the mattress is very comfortable.

Only problem, it didn't expand the full 12 inches. After unpacking I let it "rest" as instructed the full 8 hours. It now measures approx. 10 and three quarters inches. As far as comfort goes its pretty good, but I do wonder about it not being cool in the warm weather if it ever gets here. Next question don't know if recommend?

Heated over night but an over fill matress pads help, it's really good no more back pain, in the morning more energy to just wake up in go to work I used to sit down for the back pain relax stretch now get up in go.. I recommend this matress it's really good and a good price too.

I couldn’t believe that a mattress that is delivered rolled up in a box could be a comfortable and good quality mattress. I was completely blown away when I unpacked this mattress and tried it out for the first time. I have to say that this is probably one of the most comfortable mattresses that I have ever owned. It contours to your body so well that it feels like you are literally floating on a cloud. I would highly suggest this mattress for anyone looking for a high quality mattress for a relatively reasonable price. I would highly suggest this mattress to anyone looking for a good night sleep.