I read the other reviews before making this purchase, and tried memory foam mattresses in the stores. This mattress exceeded our expectations. It arrived quickly, and expanded to its full size quickly. My wife noticed a slight odor but I did not. It is firm, but not too firm. In fact, I think it is slightly (just slightly) less firm than the firm mattresses we tried in the store. I read that memory foams can be hot, but that this mattress has a special cover to prevent that. I don't know if it's the special cover, but I don't feel any more or less heat than I did on our old mattress, which is good. Of course we won't know for years if this mattress will hold up, but as of now I feel that we got a great bargain compared with the store and/or brand name mattresses. If you are going to buy a memory foam, this is a great choice.