Does anyone have experience with the headlight modulators from Comagination, Kisan, Signal Dynamics, or Kriss?
I am leaning toward a comagination unit, although I have not been impressed with their answers to questions about differences between their 75W and 115W H4 units and other makers of higher priced units seem to take shots at "cheaper units" without naming names.

I'd appreciate hearing from folks who have used any of these; I am curious about their convenience, longevity, and whether they affect bulb life.
No flames, please, I have read all I can find and I do plan to install one in my high beam for safety where needed, Like in town to help avoid left turners.