My wife and I purchased this mattress to replace our 11 year old Serta Perfect Sleeper pillow top. We have had it for several weeks now, and it sleeps wonderfully. I am hot natured, but have not been uncomfortable on this mattress, which I was worried about. I don't see why I would EVER go back to an innerspring mattress again. Of course, the "O" makes it easy to purchase and delivery was timely and inexpensive.