OK, now that I have been using that light for a dark am commute for a while, I have to say I am impressed and pleased with my purchase. It is bright enough for me to commute to work on an unlit bike path at 17-20 mph. I mounted it with a twofish lock-block on the handle-bars, and am more than pleased. I am going to get another one for when it is winter and dark on the way home as well, and mount it on my helmet.