Very cool, if not perfect (to me). They are very easy to assemble (bar ends on the side) and can be removed at the marked ends to protect against theft when city traffic is closed. The picture is clear and quite wide-angled. In general they are great. My only criticism is more about the downtube bars than the mirrors. To use them, you have to look down so far that your eyes completely wander off the road in front of you, little better than just tilting your head back. So not perfect but still nice and definitely cool at night when you see the headlights out of the corner of your eye. If you ride more aggressively and lean very low over the bars, they're great and don't require a change in vision. If you ride a little more upright like I do on a cyclocross bike, a helmet mirror is probably your best bet and my next investment. Overall a great product but not necessarily for everyone with drop bar style handlebars.
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