I have back issues and the PerfectSleeper mattress was very comfortable the first few years. I have had it for 4 years now and I am trying to find a new mattress. A few months ago the pillowtop started caving in the middle and it has been slowly sinking deeper. We are normal sized people, there is no excuse for it to do this. I am getting irritated from trying not to roll into the middle and our shoulders have been hurting worse and worse. Plus, I just went to pick it up from the bottom and my hand ripped through it. If it did not cave in the middle it would've been a great mattress. I do not think they will warranty it, because I do not have the receipt and the store closed. BTW buy the mattress cover they offer, the pillowtop is impossible to clean.