I use mine as well and thus far, they are working (fingers crossed). Definately nice with these cold days. I hate driving with my jacket on so having the seats heated up to keep me warm until the heater kicks in allows me to shed the jacket before entering.

I've had heated seats in other vehicles as well and while they are great, they do fail and in my mind are way to expensive to get fixed (unless you do it yourself and even then the elements aren't cheap).