Oh my…at 100% mine feels like the hardwood floor. Lol.We have a King without the adjustable base. When we first got it I thought it was not firm enough, compared to the previous mattress. I set it at 100% firm but still tossed and turned like on the old mattress. Tried lowering it to around 70 and now I don't move around very much at all. Back and shoulder pain have gone away. I did have to get Sheex cooling sheets, and turn off the active pressure adjustment.