Well, 13 years ago we bought a Posturpedic and it was good for about 5 years only but we finally replaced it after 10.
Next we bought a memory foam from Costco... like sleeping on a cloud for awhile but also a furnace and I'm hot blooded already. After 2 1/2 years it had dents in it where we slept and you cannot turn them over. You can only turn them around, didn't get our money's worth from that one.
We finally tried out the sleep # bed. It's been about 2 weeks now. I have to say, it takes a bit of getting used to but now it's great. My back didn't like it at first because it wasn't used to sleeping with support.. I have to admit a bit of buyers remorse for the first couple of days to spend that much money to be sleeping on an air mattress....LOL bottom line, it's worth the money.