Dang, I just bought a dual zone heated mattress cover. Absolutely love it except for the fact that it's all manual; you can't turn it on remotely or schedule on and off times (although it automatically shuts off after a fixed 10 hours). I often go to bed later than my wife, so have to sneak in to the bedroom 15 minutes before bed to turn my side on (or leave it on unnecessarily, or get into a cold bed, defeating the whole purpose).

This is actually less expensive than the one we bought, and obviously much more feature rich.