I have had this mattress for about a year now and it is fantastic. Sleeps wonderfully and i feel great waking up. I am a fairly small gal, and my BF is about 250 pounds. When we sleep on this bed, it doesn't create the dreaded "valley" that you fall into. You know what i'm talking about. The heavier person creates a hole that the smaller person is always rolling into. Sleeping on the side of a hill is not fun. Problem solved. Buy it.