We bought a memory foam king last summer from Sam's Club because DS was starting to move around more and the full was just too small. Within 6 months you could tell where we slept and we are both lightweight :( However, we loved the king and we loved that it didnt' move when someone got in or out of bed (that is also starting to go away).
So, if you have a latex or memory foam mattress, how long have you had it? Do you still love it? Where did you get it?
We are going to scrape together as much as we can to get a quality one, but I don't want to spend that much only to discover 2 years later that it wasn't worth it. I've searched on latex and on foam and I see a lot of people recommending their mattresses, but no one ever says they've had it for awhile and still love it.