I just posted this HERE but I'll duplicate it for this thread:

I put Posi-Quiets on mine and then took it for a track weekend on the road course at California Speedway. Very little dust after hammering around the track for a couple of days, virtually nil in day to day driving. Stopping power is still excellent (ask the guy in the 911 who I outbraked from 125mph going into turn 3!!) and they have never squeeked once in almost 7000 miles of use. Highly recommended.