I bought this mattress in Nov 2012. The first 10 months were okay. I say okay because I had to get use to the memory foam which was nice and firm as it should be for a form mattress. Then it happened, it started to break down on the one side I slept on. So I rotated the the mattress and soon after that side also broke down. So when you look at the foam mattress you do not see a sag, but when you push with your hand you can feel there is nothing there for resistance or support. I have called the retail store which sent a service man out to look at it, He even said yes that the bed had broke down and had no support. I was notified today that Serta was turned down my warranty request because it has not sagged the 1 1/2 inches requested to measure the sag test. Wow!!!!! NEVER BUY FROM SERTA.