I've had both headlight & brake light modulators for about 4 years. As was said by others, I wouldn't be without them. I've never experienced anyone confusing the rapid flash rate of the modulator with a simple flash to 'go ahead'. However, and maybe it's my imagination, I have seen folks who appeared to be considering pulling out, that then saw the flashing headlight, and stopped their forward progress. Many times. And, contrary to many conversations I've heard while hanging out at rallies, from guys who just seem to attract people that pull out in front of them daily, I honestly have had no one pull out in front of me in 4 years and 20K miles. Seems unbelievable, but true. Like I said. I won't ride without them. Of course, the rear of my bike looks like a Christmas tree when I hit the brakes. But, hey, it works.
These are the times that try men's souls. The summer soldier and the sunshine patriot will, in this crisis, shrink from the service of their country; but he that stands by it now, deserves the love and thanks of man and woman. Tyranny, like hell, is not easily conquered; yet we have this consolation with us, that the harder the conflict, the more glorious the triumph.
Thomas Paine December, 1776