I have this light too and am very pleased with results so far. The light this replaced was the Turbo SuperFlash and the problem I was having with it was it popping off the seat bag that I keep the lights hanging off of.

What I do for adjusting the light is to aim the light at the ceiling, preferably a white ceiling, and work your adjustments that way. Keeps you from being blinded and you can still watch the light. Also what I REALLY like other than having the ability to adjust the light, is having the one mode where it flashes really slow. This is a fairly good compromise when rolling in a group. You aren't blinding the riders behind you*.

* This is all an assumption cause I'm not behind my bike and I haven't been behind a light with this set like this yet.