Just as a side topic on this issue, I have noticed that the Bi-Xenons on my car sometimes get 'jolted' out of position, and drift up a bit before settling again. Part of the self-leveling system I guess. Does anyone else get this?

I seem to be getting a lot more flashes from other drivers at the moment - I don't think the lights are out of alighnment... perhaps I'm just being paranoid. This is the downside of having such bright lights - they annoy others, provoking a little road-rage aggressive driving sometimes.