Does anyone know if this bed is any good or not? It has a thick 3 inch foam on top and I am not sure if that will be comfortable or not. Our last Sealy was good being just a pillow top, but has deep impressions in it now since it is 9 years old, and it really hurts my back being in that slump each night. This one is 15 inches thick and we are not sure if it is going to support our backs enough. We were thinking of going with a Sealy Posturepedic Crown Jewel Luxury firm plush pillowtop, but the sales lady thought it would be too hard for me. I do like medium, but I am not too heavy so I need something where there is some give.I can't handle something too firm, but I like one that supports my back and hips. What do you think? We are not sure about the extra layers of foam on top especially so much and also the edge support may not be there. We don't want it to sink in later or bend at sides. It seemed to bend easily when I sat on the edge at the store. I was told this is a lot better bed for the Black Diamond one and that I should go with that one and that the foam will relieve pressure points.