Haven't had any problems out of it except for the HVAC control door. I still get heat and a/c, but it comes out of the windshield defrostor vent.
Off-road ability. I've gone twice the places in this thing than I did in my Jeep. The 4Lo 4Hi, and AWD auto settings works great together. When ever I start to get stuck i can just run though the settings, and get myself out!
For the Z71 Id make it a little higher, and more powerful, and I'd intergrate a GM factory adjustable brake controller for the vehicle, it would probably work a lot better than the aftermarket ones.