Not much. I mean, I have used BT in my truck, but I can't say I've ever had both on at the same time. But in my experience with it, the only thing I don't like about it is that it doesn't like working when it's below freezing. It shows more static on the screen when it should be black and quiet. But recycling the power (via my power switch, not the one on the monitor) usually eliminates it. Quick and simple. And once the truck warms up, it goes away anyway.

In any event, I'm happy with it and it comes in VERY handy like when changing lanes in traffic - it's easy to see when you're past a car and can move over - and aligning the hitch with my trailer. But mostly, just for seeing what's behind me when backing down the drive.