I use a bar end type mirror too, on my hybrid, haven't tried it yet on my road bike. One thing I've found with different types is the amount of convexivity (convexness?). whatever, varies. Some of them make the object appear so small that it is too close by the time you see it in the mirror to be of any use. I actually had to combine two different types to get the best mount/mirror combination. As Rainman says, for commuting they are ideal, but don't forget to shoulder check as well!