Don't buy this unless you know you will replace in <6 months

Initially the mattress was good. It was the correct firmness and quite comfortable. After less than two months, indentations started developing. I thought this was somewhat normal but they continued getting deeper and the edge support started failing. I half fell out one night after about 4 months which hasn't happened in my adult life. My toddler started "rolling down the hill" yelling "weeeee!" This was when I initiated a replacement request that has yet to be realized another 4 months later. Since the funhouse experience with my kid, I've started waking up with sore joints and muscles and a limb here and there that's completely numb and temporarily immobilized. After a few more near misses on the edge, a husband who has started snoring excessively for no other identifiable reason and random, annoying aches, I'm still left hoping that when Sears "inspects" this in order to honour the warranty, they won't come up with some completely unrelated voiding condition.... I feel like the mould-casting of my and my husbands essences should be warrant enough for premature replacement.