I found that it is very heavy for a double mattress, thus difficult to move. In my opinion, it is firm, not medium firm, and I was disappointed when I first slept on it. For the first three nights, my back hurt quite a bit when I got up in the morning; that gradually stopped after about a week. After having the mattress for about a month and a half, I've gotten used to it and sleep well but still wish I had chosen a softer one or at least a mattress topper. I do appreciate the support around the edges and the quality construction.