Just upgraded my brakes from Avid Arch Supreme rim brakes to Formula R1 discs. Huge improvement in modulation. Set up was very easy. I cut the lines to get a clean install using the included hardware (olive?) and rebled the brakes thoroughly. I followed the bed in procedure and hit the trails. The brakes are crazy powerful and make no noise. I even rode in soggy conditions yesterday and they were flawless.

Just my two cents on these brakes...couldn't be happier.