Join Date: 1st October 2006
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I had the auto-dimming mirror on my Accord and it worked brilliantly. When a car behind you is glaring its headlights at you, the mirror (in a second) turns into a dark green and it looks like you're looking at the mirror via a night-vision system.
In the case of the Civic though, the rear spoiler blocks much of the glare from cars behind you, so it's probably not worth it. In the Accord, it was part of the standard spec for the EX!