I wasnt going to review this product until I had it for a while. 1 year later, here's my review: PROS: - with memory foam pads, the thicker, the better. 4" is the thickkest ive seen available out there. - decently priced. you get what you pay for - never woke up with a bad back, also considering i sleep on my side and chest - i sleep longer CONS: - it is heat sensitive: if it's cold in the room, it's firmer, if it's hot, it's softer and it's no longer a "memory foam" but a regular foam. - with that said, the area/shape you sleep on is not really a "memory foam" because of warm body temperature - the more it is exposed to the air (especially the edges), the foam turns from white to yellow like the rest of the regular foams - it's about 2" short from regular mattress size. but i suppose that's to make room for the fitted sheet to cover the mattress and the extra 4" thick memory foam. - im about 120lbs, the firmness is perfect. but i dont know about those heavier than me, because like i said about the heat/temperature problem, you might find your self sinking down making it a bit uncomfortable in the summer.