we have had sleep numbers for almost 20 years. Lost two in a house fire. Had one for us, one for daughter. We got replacements. Like any other mattrass don't buy the cheap one. I like the fact that my side can be as firm as I want it and she can have her mushy side. My complaint would be that my side at 100 isn't quite as firm as I would like. (I can fall asleep on a board.) No problems noted otherwise, except, when we travel, I do not like how soft some mattresses are. My In laws have all sleep number mattresses there to. One of the things that led to us getting the first one, was the narrow stairwell that went around a 90 degree corner. I cfould not get a regular mattress or box spring up the steps. The sleep number went up no problem, to be assembled in the bedroom.