The mirror mounts via a split post much like older handlebar stems. It requires you to remove the end plug or cut a hole in the grip. I had conveniently lost the plug from the left end of my handlebar when I crashed earlier this summer, so that was already take care of for me. Doh.
The unit is mostly plastic so I'm hoping it'll hold up. As long as I don't clip it on something or crash on the left side it should be OK.