For your own usage sight over the same shoulder as the mirror. Much more ethical of a shot that way. Don’t use a revolver the cylinder gap would bust your nutterbustin eardrums. On a serious note have you considered an inspection mirror. I just don’t think the hat clipped mirrors would let you see enough.
I just put it in the cart. I'll report back once I get some time with it. Somebody has to take one for the team, and it's not like I have a reputation on the line.
I think it will drive me crazy at first, but have the potential to become a "why didn't I do this years ago" thing if you stick it out. Think about how naturally you use the mirrors on your car. With it mounted to your head, I think you could learn to pretty instinctively tilt your head and pick up on stuff.
If nothing else, it'll be a fun video.