I too purchased top of line stearns & foster, the plaza, manhattan reserve, queen size, 2 1/2 years ago, I am only one person, 120 pounds, w/in four months the edges remained firm, however, in the middle was a significant dip, making it impossible to sleep there. I now sleep on edges, if I roll into middle, will awaken with back pains. I wish I had reviews of this item, I dread the thought of having to deal w/stearns & foster; they don't even appear to have a telephone number to complain to (hah hah hah, why am I not surprised). read full review »