I have the auto dimming mirror and I can tell you, I wish it had an on-off switch. When cops are parked around here, they won't pull out for you going 5-9mph over the limit, but if they're behind you they'll pull you over for it. The mirror is so dark that when it dims, you can't see anything but the headlights, so when someone's behind you, you have no idea what kind of car it is. Kind of annoying. I think I'm going to figure out a way to cover up the sensor to turn mine on and off.
The Storm Trooper:
2012 Focus Titanium 4dr - Plat White - Arctic White Pkg - Prem Pkg - Wint Pkg - Moonroof