Talbot mirrors have been in our scene since day one. The bad part is that mounting one so it looks good on the door, and being able to actually use it, are two completely different things.
This is the truth.
I mounted one on my drivers door and it looked great, as for visibility.... I saw the rear fender and that was about it, on maximum adjustment outwards! If you could put a convex lens in so that it gave a wider field of view then they would be pretty functional. I think they're really meant to be mounted further forward on a quarter panel or something like that, I don't know?