I installed these pads about 300 miles ago. I machined the rotors (as any new performance pad should be) and installed them with new NAPA hardware since the pads didn't come with sliding clamps. After a 200-mile "braking" period (when only a small squeak was heard when stopping) they increased the efficiency and stopping power so it was easy to spot. They are moderately dusty compared to AC Delco pads, but dust washes off more easily than most other pads. I took it off and tested it under load,