Originally Posted by dobber
While I think the o-ring mount system is rather unique and transportable, my biggest concern is the fail-safe. O-rings deteriorate. O-rings snap. Things happen. This little bugger is mounted under my butt, I'll never know it's gone. If the sucker had a little lanyard for lasso'in round the post, that would be enough.
The o-ring system also limits ones ability to "aim the light or mount it to other frame members, like a chain stay.
I have a Lupine headlight that uses the O ring attachment and it works great (as a headlight mount). I have been using the same o ring for three years so the extras I bought have been sitting in a drawer for awhile now.
I can switch from bike to bike or just remove it and bring it with me in a flash and I don't need extra mounts for my other bikes. If I were to crash hitting the ground would swivel the light around the handlebar rather than smash; as it would with a fixed mount.
Its a great system for headlights, but I won't purchase the DiNotti taillight because it uses this same mounting system. The mounting would work if you were mounting it to something that is perpendicular to the ground, but mounting the light to your seat post means you are probably mounting it on something that is on an angle that is not perpendicular to the ground, most seat posts are set at a slightly reclined angle.
This means the light ends up pointing down slightly instead of straight back. And this is the problem for this tail light, great light but you can't adjust the angle to point it directly at the cars coming up behind you.