My husband and I were sleeping on a 9 year old Tempurpedic mattress, when I recieved this one to review. We both felt an immediate difference in how our backs felt after just one night! The medium firmness supports us both, I'm a side sleeper and he always ends up on his stomach. The cooling aspect is perfect for my husband, he now sleeps under the covers instead of on top! I'm very happy with this mattress and probably would have picked it out for myself, if I were out mattress shopping!