Problems w/auto dimmer...
The auto dimmer thingy works fairly well except, when you have a flatbed with louvred headache rack (or anything else that blocks portions of your rear window.
The mirror has a light sensor on it to tell it when to dim. If a shadow from whatever is over your rear window falls on the sensor, it brightens the mirror up, letting the guy's lights blind you.
I sure wish I had the old fashioned manual kind of mirror! Has anyone figured out how to take one of these mirrors apart? It seems to me you could bypass the sensor somehow and make the switch dim the mirror when ON, no dim when OFF. Or, maybe figure out how to remote-mount the sensor so the louvres don't get in the way. Either way would make me happy...
-cj