Great Visibilty Not Watertight
Its very bright. I love the mounting system, especially because Its basically the only thing that I've found capable to mount to my seatmast. I rode it in the rain once and since then its decided to turn of kind of randomly which is not the safest (It was never submerged by any means, just road spray). I believe its water vapor inside that condenses in the cold at night and shorts it but i can't get the case apart enough to dry it out.
If you don't get out in the rain much this would work great, but it is by no means watertight.