I had a headlight modulator on my last bike (KLR650). I think it was a Signal Dynamics and was pretty easy to install.
Modulators are one of those things you just never know for sure if they work or not. I had the modulator on my bike for almost two years and no one pulled out in front of me, does that mean it worked or does it simply mean no one pulled out in front of me, I don't know. What I do know is that they are irritating, which as mentioned, could be a good thing, could be a bad thing. There could be five flys around you but you notice the one that keeps landing on your ear because that one is the most irritating, the down side is you really want to kill that fly.
My personal opinion, modulators do draw most people's attention to you because people are wired to look for flashing lights but don't depend on it to get everyone's attention (there are some people who wouldn't notice the space shuttle taxiing down the road), continue to use good riding techniques like using lane position, speed, having a way out, etc to get people to notice you.
I'm probably a minority but I think less of hi-vis clothing than most. 75% of car vs motorcycle accidents happen to the front of the bike (ie: people pulling out in front of you) and that's where hi-viz clothing and helmets are the least visible. You guys with hi-vis, sit on your bike and have someone take a picture of you from directly in front, I think you'll notice that not much of your jacket or helmet is visible from that angle, it may even be hard to tell what color it really is. So, while hi-vis is certainly not a bad thing, I don't think it can be considered to have a substantial effect in avoiding front end collisions.
That being said, the second most popular car vs motorcycle accident is to the rear. I think a hi-vis jacket and helmet do help alot in avoiding rearenders.
Last edited by ray h; 05-26-2013 at 02:59 PM.