Our plus size son and DIL have one. They like the adjustable part, but son like his mattress hard and she likes soft, so he feels like he "rolls" into a well in the middle. Does that make sense?
We have a adjustable foam mattress not Temperpedic. I think it is Sealy too. Love it and it is more affordable. Foam can be too warm if you get warm. It holds the heat. There is one brand that is addressing that issue. It may be Sealy.