This bed arrived about 3 days after ordering it, so within a week of ordering it I was sleeping on it. I wasn't sure at first, as the memory foam does take some getting used to if you've spent the last three decades sleeping on springs. But my old mattress was over 25 years old so it was time to go. I was concerned about the heat with memory foam, but Southern California ust spent three days and nights in a heat wave, and I noticed no difference in the heat of this mattress, so that was good. It is comfortable, but it will take a lot of getting used to, especially if you are a tosser-turner like me. In the middle of the night, you want to roll over and the springs of the mattress would assist in that, giving and bouncing a little. With this mattress, there is absolutely no bounce or motion, so it is a bit more of an ordeal to do things like turn. That being said, the mattress is extremely comfortable. It is very firm-not like sleeping on concrete, but certainly not like sleeping on a cloud. I have noticed a significant reduction in back pain upon waking since I've been using it. The mattress has, so far, not developed a deformation from laying on it, but the warranty information protects against serious deformations. Go to a mattress store and try out their firmer mattresses. If you like them, come on back and order this mattress. For the price, if a firm memory foam mattress is your thing, you can't do better.