I have never used the day/night feature on any mirror of any car I have ever driven in my entire life. When the "night" mode is selected, you can't see squat. Completely worthless feature from the day it was invented.
No, dimming mirrors are the 3rd greatest automotive invention of all time.
1. Fuel Injection
2. Air Conditioning
3. Dimmable mirrors (esp. autodimming)
When are you using it? I usually use the dimming feature during the day to minimize glare from the sun over my shoulder.
