I WAS shopping around for matresses about a year ago. The sales guy pitched it as "it's the same price, actually a little cheaper in the end, as most matress' are recommended to be changed after 10 years. 3* matress' in 30* years, whereas the Tempur matress is warranted for 30* years...."
The * equates to the actual number, I can't remember it. I do remember him saying though that the tempur as far as final price goes was around the same or a little cheaper than buying/replacing matress' over the years...I just never got around to buying one, and my mom gave me a new Sealy whatever matress that was brand new, stored in the garage.