I ordered this to replace an old memory foam topper that was loosing its integrity (It was starting to ooze off the mattress like melting grilled cheese). I just had surgery and knew it would be spending a lot of time in bed, and the old topper was making it difficult to get comfortable while I am stuck sleeping on my back in pain.. This one is working for me. Initially I thought it would be too soft, but it has grown on me. It is soft, but it is also firm enough that I don't get stuck in the body depression in the middle of the night when I need to shift a little to get comfortable.  So for now it is getting five stars and I will reconsider when I get to sleep on my side again some day....  There was no noticeable odor to the foam, and it puffed up very quickly. I was lying on it pretty much as fast as the bed could be made over it!