So, I have been going around asking people this question, because it seems like most people do not like their mattress much or at least the type of people I ask.
I ask because I bought a "bargain" memory foam mattress off of Amazon that had nothing but rave reviews. I loved this mattress for two and a half years and then it turned hateful to me and it likes to hurt me in my sleep. The mattress has since sold out, but people still go back to give reviews on it years later and most of their mattresses have turned evil as well. It's probably not quality memory foam, but I'm also wondering if such a thing exists.
I have been thinking about going back to an old spring mattress with none of that pillow top nonsense, so I can rotate AND flip it.
I'm now on year three and a half and I hate my mattress. I would have liked at least six or seven years before things got this ugly.