I installed one on my 2000SE. I decided on the Kisan unit, with the exception of drilling a 10mm hole in the tunnel cover for the photo senser (my choice of location), just plug and play. They even supply text on the federal DOT law allowing the unit on motorcycles, some cops aren't aware they are legal, I asked one. It uses your factory high/low beam switch to turn on and off and is programmable by using the same switch. Most cagers don't like them, opinions are mixed among riders, it does work! First day I put it on, rode to a friends to show him, a car in his housing area pulled out 6' from a stop sign, stopped and let me pass, I even had one car pull over for me on the interstate. They may not like it, but they definately see the flash.
I was considering one, however I've read where there is a consesus of people that feel they attract attention the wrong way. The theory of looking at something and actually driving towards it. Not sure now for myself.
I bought my 2000 GL1500 SE 4 years ago and it had one. I rarely use it but on occasion when I'm aproaching an intersection with a vehicle ready to turn left in front of me I turn them on for a few seconds. I have had people tell me that some one might mistaken them to mean that your flashing them to give them the right away. I do not believe in that myself.
I failed to mention in my previous reply, I believe that the Topeka Kansas Police Ddepartment is running modulators on their motorcycles. I live in the Kansas City area and read something about it in the paper. If you get pulled over by one of these guys, you deserve the ticket!!