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Title: Not very durable.
Review: I've owned three of these, but will buy no more; it's too easily broken. It was easy to install, and it's not too hard to adjust.The biggest flaw is durability. I bicycle commute 16 miles a day, through a park and on city sidewalks. Even in this rather benign environment, this will get broken or wear out in a few months. The least impact at speed with bushes, tree branches, poles or other obstructions can crack the mirror or break the plastic mount.Also, a few months of adjusting the mirror via the friction mounts wears them out and the mirror will no longer hold position.I cannot imagine these mirrors lasting more than 2 or 3 rides on mountain trails.
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