I wrote a rant about the Box's lack of decent interior lighting compared to a lowly VW Golf at 1/3 the cost, but also a rave about this mirror feature that the prior owner spec'd for my car. The post got lost in the changeover, but there's new info..
Mine cost $600.* (half way down the "We Have No Shame" list) option including the outside driver's and interior mirror. LOVE IT.
I was not looking forward to all the 4WD pickups in my area getting behind me, but this attenuates their lumens so I am more comfortable in the cockpit.
A recent issue of AUTOWEEK had a an ad that caught my eye from these people...
http://www.mitocorp.com/html/nightvisionsaftey_autodimmingmirrors.htm
As you'll see. You can have the major feature for a helluva lot less.
Jim
*including the rain sensor - another cool feature I was expecting to poo-poo.