You have to get of the subject, the xx groupset is so uber shiney, got a couple of groupsets in work and i just cant stop my self. credit card has been hidden from me.
back to the topic the brakes arent going to be as powerful as the hope but alot lighter, if its weight loss ur after and light on the brakes then hell yeah
avids do have a few problems as do most, i have found them a little problematic under heavy pressure braking, leaking seals, this was on the juicy ultimates with a 160mm rotor. had the carbons too and they were fantastic brakes. the elixers had a few teething problems. but not had too many too service recently so that looks like a good sign
keep us informed on what you do with your brake choice