I've had 'em on a couple of bikes - years ago (RD350 & GS750). I don't remember who made them, but since it was so long ago, it's probably moot anyway. I really liked them, though. The only drawback I suffered was they tended to get bumped out of adjustment a lot more often than standard mirrors because they stick out more. They might be a bit of a PIA in places like CA where you can lane split, too.