Purchased a TP bed about two years ago. First 100 days (money back period coincidentally) were great. Since then the bed is sagging worse than any conventional mattress I have ever owned.
There are visible imprints in the bed on either side where my wife and I sleep. You can actually slide from the middle of the bed into either "hole". Now back and neck pain is common from a night's sleep in the TP bed and you have to put blankets under you to fill the void.
This mattress is all hype and is overpriced. Save your money.
Review about: Tempurpedic Mattress.