My new futon mattress just arrived, and we love it!  The hinging system holds it perfectly in place in the couch position, no slipping down. It is quite cushy, can't feel the slats. This is not long after it was decompressed, so we really didn't have to wait for it to poof up. There is no noticible odor. The vinyl is quite comfortable and happily the cat hair does not cling to it. Very satisfied. Just a note, make sure you have a  strong helper to bring it into the house and help you set it up,it's a bit heavy  Make sure that the white tag on the bottom faces the seat of the futon frame so that the hinge acts properly.