I've been using Third-Eye sunglass-mounted mirrors for years now. They provide a stable rear image. When I purchased a Giro Air Attack helmet with built in sun shield, I needed a helmet-mounted solution, thus the Blackburn.
The Blackburn's mirror bounces around at the end of its tube quite a bit, the tube is more flexible than the Third-Eye's. I can still make out bulk objects behind me but sometimes mistake large stationary objects for vehicles. When still, when I least need it, the image is clear. So far (2 weeks) the mount is sticking to the helmet just fine.
Bottom line, it is serviceable-I can see well enough to know that someone is coming up on me-but I could do better. I would look at other mirrors before replacing this one with another of the same.
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