NAV-TV works. The reverse camera "force on" just has to be enabled in te programming before you install. (you need a computer and internet to do this the 1st time, then you can just hook your computer up to it in the future to make changes). I had to work through some intermittent problems but everything works. Some of the glitches I was seeing was fixed by going back one firmware version and they assure me that the new on coming out this week or next will fix everything I was complaining about. The one complaint I had is the reversce camera wouldn't come on all the time.
Install was cake and I don't have to do anything to activate it. If anyone gets one of these, keep in mind, if you update in the vehicle, you have to wait until everything powers down (5 minutes or more, and opening a door will re power everything) before updating, otherwise it won't connect.
Happy camper so far.
2011 Jeep Grand Cherokee Overland, Dark Charcoal Pearl, 5.7L Hemi, Offroad Adventure II Package, Media Center 730N CD/DVD/HDD/NAV