LOVE THIS!!! I get a lot of leg aches, and it helps me a ton to be able to raise the foot of my bed to elevate my legs. We have a king size Purple brand mattress on it. I worried it would be too heavy, but it works perfect. One word of caution... When the bed is laid flat, there is no motion transfer (which is one of the reasons I got a Purple mattress). When I raise any part of the bed, you feel every movement. I still love this and only wish I had gotten it sooner.