We purchased a Kingsdown Sleep to Live mattress from Sleepy's in early July 2009. The first mattress had a very clear sag in the center of the mattress to the point that we sank way way down into the mattress and felt that we were lying far below the level of our feet. Sleepy's was good in that they replaced the mattress immediately at no charge and the second mattress seemed better for about two weeks. Now, it too, is developing the same sag as the first one. My husband and I are slender, no more than 150 pound between the two of... read full review »