I just wanted to say that Bryan did my wheels while doing my car, and that I've heard a lot of complaints about brake dust, especially from an M-Sport brake package.
In my opinion, brake dust is minimal with opticoat. On my e90, it use to really cake on, but after 2 weeks without washing, what's on there doesn't look too obvious and I can easily remove most of it with a simple spray wash!
What comes off the brakes doesn't attatch to the wheels as much and what does can easily be rinsed off.