I ran them, liked the looks and even was a proponent of using them as they give you a really nice side field of view ~20 feet total side to side. The biggest problem...no view directly behind you. Oh you see it, but the perspective is so far off you can't see what your really looking at. My buddy and I ride staggered on the road and I could not even see him when he was in the second tire stripe behind me.
Went and ordered a nice set of mirrors to replace and I won't go back. A lot of relief being able to see behind me. IMO if STMachine put a little more engineering behind the mirror and gave a better layout to address what is their weak point...these things would be killer. Good luck on which ever way you go!