Took me about a week to get used to this, but it does work.
http://www.linquist.net/motorsports/tech/mirrors/
At first it was odd, but once you retrain yourself to use the mirrors this way it's very good. If a car is in my blindspot halfway for instance, the front half of their car is in my side mirror, and the back half is in the rear view mirror.
The rear view mirror is too big as well blocking some view. I bought a rear view camera, and plan to put in a thinner mirror from another GM product.