Quite a nice, clear picture (though it doesn't like sun in it). Maybe a half second delay switching when you go into reverse. Signal reached 5 metres through my aluminium skinned motorhome. Only need to get wires from camera to reverse light, so saves having to get wires all the way to the dashboard.
My biggest complaint is it's a little ugly. I think it'd look a lot better if it had a cover (which could be held on by a single screw) to hide the mounting bracket and screws