Well I just tried my rear defrost out for the first time today after getting some snow while at the gym - doesn't appear to be working. Didn't clear any fog / snow after sitting in the parking lot and a 10 minute drive home. Also tried turning it on and off with everything else turned off and couldn't hear or feel anything happening in the tailgate. Called customer support and they ran me through some suggestions but no dice. Service appointment scheduled but definitely frustrating since the soonest one is a week+ out.