I bought two because if I like one (I only need one at a time), then I'll have another one when the first one gets too old. If I don't really like it, I can still take back one because I won't have used it at all. I have to let the one I do try air out before I use it, so I probably won't try to sleep on it until the weekend when I don't have to get up early if I can't get to sleep easily.