I just got Avid mechanicals 2 weeks ago and they have been great. Very easy to adjust yourself. However yesterday I was disappointed to find that the adjuster knob for the outer pad in the front isn't working anymore.
You can move the pad inward, but it comes in crooked and you have to press something in there to straiten the pad. When trying to move the pad outward nothing happens. Once again, in this case I needed to push the pad back out by pressing against it.
I was able to get my brakes to work properly again after all this fidgeting around with them, but I will have the front brake replaced by the manufacturer soon. I am not looking forward to being stranded off the bike though cause we're finally getting some nice spring weather up here in New England.