I went to test drive the Volt in Oregon (just arrived here!) and had a very strange experience that almost set me off against the vehicle. I adjusted the rear view mirror for the drive, the way one normally does, and found that the top half of the image was blocked by the ceiling bump where the OnStar, etc. lives. It made what is charitably a "modest" view out the back essentially very bad (unless all you want to see is the tires of approaching vehicles).
As I drove around, fully enjoying the car other than that I kept thinking, "They can not have let a design flaw that big slip through. I must be missing something." While the salesman looked on, concerned I might break his new pride and joy, I finally pulled the mirror down, rather than just adjusting its orientation and voila! Problem solved. In all my years of driving, I've never seen a rear view mirror that not only pivots on its base, but has a "swing down" capability on the arm that attaches to the windshield.
My advice to GM, have the car leave the factory with the arm swung down so others don't get into this trial and error mode.
Ordering my 2012 this week.....
[scottf200 update]Click here for the post in this thread that shows pictures of this.[/update]