I recently started using a Cygolite Rover II. It's great so far - even on low it makes a great headlight for darker areas (mostly MUPs after dark - all roads are brightly lit) - far brighter than my Cateye EL320. The problem is when the light is on flash mode every sign with a reflective surface within a few hundred yards flashes brightly - literally signs WAY down the road are clearly picking up the light brightly. I've checked and it only seems to flash in its brightest mode. I'm usually biking around Boston so there are tons of signs. I came up to one intersection and it looked like a dance club .

As much as I think it's cool I'm sure it's distracting to motorists and some may be wondering where the &#&#*@! is that light coming from when I am a few hundred yards away . I'm willing to bet that people can see me coming from a mile a way though which is probably the point.