Does anyone run a headlight modulator. What do you think about them??

 

I don't run one, but since you asked about opinions: as a rider, I appreciate anything that can help give me the edge as far as being seen. But as a motorist, I don't like bikes with modulating headlights - I think they're too much of a distraction. Target fixation works on cars just as much as bikes, and I don't need a driver staring at me.