I've been using the Kissan modulator since 2005. In my training class it was suggested. The instructors said, for a single headlight, use a modulator, or if you have a lightbar (3 lights), then you don't need a modulator.
I'm in Canada, where daytime running lights are required, and motorcycles just blend in too much with vehicles. A m/c isn't even visible until they are much closer to you in traffic. I've witnessed this myself.
So, I use a modulator on my wife's bike, and use my lightbar on my bike. They are both very effective, and both setups have saved me more than once.
While many people on forums say that modulators are annoying, I have yet to experience that. I've had driver's give me a thumbs up for having one. There is NO way you can disappear while using a modulator.
I don't use the modulator if riding in a group (there is a light sensor and will turn off when put on low beam). I also used to ride with high beams on until I got the modulator. The high beam thing was probably most annoying for drivers.
So, yeah, I'm one of those safety geeks. I have a white helmet with some 3M high vis tape and wear an Icon his-visibility vest when dark out. I rely on nobody to see me, and I feel I mitigate risks by how I ride and what I can do for others to see me.
I also have a brake light modulator from Adventuretech (see the video in the link below).
http://www.adventuretech.ca/
I have an LED light strip on my license plate frame that only comes on when my brake lights are activated. Traffic is VERY aware that I'm slowing down or braking. Having been rear ended at 70 km/h (45 MPH) once before, nobody can say they didn't see me brake now. I was taught to flash my brake lights as I'm slowing or braking to catch the eye of those behind you. In a quick brake situation, you just can't do that. The flashing pulses make those behind you aware of what you're doing very quickly.
In my experience, this is the way to go, and it works for me.
H.