We have always used futon mattresses on our beds. Most have them have been wonderful. We did have one dud, though. It was only about 2 years before it had 2 distinct grooves from our bodies, even though we flipped and rotated periodically. I wish I knew what brand it was so I can make sure I don't get that again. Now, we have a Gold Bond futon on our bed. I think it has a layer of foam in it, which I'm not thrilled about, but after that crappy one, we were concerned about compression and decided foam might help with that. We have plywood between the boxspring and the futon; it's a cheapo boxspring and we were starting to feel it through that crappy futon. We also use a featherbed on top so there's still that firmness and support, but it feels soft under your body. DD sleeps on an all-cotton futon on the floor.