We have the tempurpedic, only because that's what DH wanted for the firmness, I really wish we had the sleep number to balance our differences.
I swear the first week we had it I must have lost 10lbs. it must not breath easy because I would sweat all night long (sorry TMI) I am pretty used to it now but it took me a couple months to get used to, I still sweat at night just not as bad.
So that is my experience with the Tempurpedic, hope that helps a little.