DO NOT JUST QUICKLY SIT OR LIE DOWN ON A MATTRESS, ROLL AROUND ON IT, TWIST, TURN, SIT UP, LIE BACK. Sorry about the all caps, but I can not stress enough how important it is to really try out the mattress first, but actually trying it in every conceivable way before you make a choice. My DD bought a new mattress and insisted I come try it out. It happened to be a pillow top, which is not on your list, but this makes my point for me. She still raves about that silly mattress, but when I lie on it, I can't move, and my back just screams with pain. See if the seller offers a "money back try out period" would be my best suggestion.