We have had the mattress now since the beginning of June 2010. Although it has been just a couple of months, we love the mattress. We have had four mattresses over the last 6 years. My husband has had two major back surgeries and suffers from severe back spasms. He and I both cannot believe how well we sleep now, he still has spasm occassionally but not from the mattress,this is the first time since he had his second surgery. It is firm but very comfortable for me as well, it molds around you. I honestly cannot tell the diffference between the higher priced mattress (my daughter has one) and this mattress. We are in our 40's and are still very active. I did not realize how much not getting a good nights rest was affecting us both. It does tend to get warmer than a normal mattress, but we are okay with that. We just changed the pad and our blankets. It will feel really great this winter,we can't wait. We are completely satisfied!!