Purchased the 12" Queen. Was hesitant to try a fully foam mattress; mainly due to so many complaints of mold, but i've also never had a foam bed. Bed arrived and was completely clean. I hate firm beds. I like to sink at least a few inches. This bed is great for me. I'm a mechanic and do in-home remodeling on the side. My knees, back and neck are always killing me. Especially since I had an accident a while back that caused slipped discs in my cervical vertebrates. I added a 3" gel topper, so this bed actually sits 15" high and I sink almost a foot into it. I'm 6'2", 195lbs. I also get very hot when I sleep. This bed seems to dissipate heat pretty good. Then again, the full bamboo sheet set helps as well.
The only downside I can see is what some customers have already complained about... The fitted sheet does not like to stay on the corners. But, I'm not going to drop a star on the rating because of that. It's foam, not Styrofoam. What do you expect?
Now, I can't speak to the longevity. If I remember to update this review a while from now, I'll let you guys know. BUT.. I will say this.. My alarm has to work overtime to get me out of this bed in the morning!