Well my "Bike-Eye" arrived (by mail so no signature required), and I would rate it about a 6 out of 10. It of course depends on the bike but on my Surly, it is just OK. You have to move your leg out of the way to see it and part of my bike bag shows up in the mirror and it is not a huge bag. Just an under seat bag but it is enough to block a part of the mirror. So I have to move a certain way to see everything behind me. On the plus side, it does not vibrate when attached to the frame, it shows a fair amount of what is behind me (when I maneuver into position) and I think I can used to it so it is not wasted money. So until someone invents the wheel (or in this case mirror), it will do.