ok one thing that no one has said is that the bulb is compatable with 12mm bolt up or Qr or with bolts in the end (when you order it ask for it threaded).
as to the noise they are not loud but the ferquency is higher!
and as to the brakes the fitting is IS so any IS disc will fit!
but a word on the front one if you are getting the 20mm kit and are going to use it on a Marz fork you might want to get a 1mm disc spacer ( to go between the disc and the hub.