We love our new Serta Sleeper mattress. The new mattress fit perfectly over our existing box spring and looks as good as it sleeps. It is what I would call a medium firmness which I like, the Goldie locks version, not to firm and not too soft. It is a very pretty mattress as well and the top cushion is very soft. It has been a month so far and it still feels the same. I believe we will enjoy this mattress for years to come.