I wish you luck with your new mattress. I'm actually getting fed up with my select comfort bed. We bought it 5 years ago after my husband broke his back. It was extremely comfortable at first, however Mr. passionfruit's side sprung a slight leak, and now after replacing the air chamber on his side, the new air chamber on his side is leaking too. The mattress has lost it's original shape, and is now visibly lower at the head than at the foot, and until I can figure out what to do, it is causing us a great deal of discomfort anfd reflux.
Huh. Hey - there's a 20 year warranty on it I hear. And if you can't get a new one, just turn around and sleep the other way !! :-)