As a commercial truck driver in Portland and bike commuter, I completely agree with Patrick. Flashing blinkies are more difficult to place on the roadways. Much better then nothing, but slow pulsing or random flash with steady between flashes works best. Since switching years ago to a Hot Shot from Superflash and switching to a slow pulsing setting, I get much more room from passing vehicles.

It's also much better driving/riding behind none flashing lights.

Flashing lights cause me to look away from the light source, not what you want drivers to do.