I'm very impressed with the Bosch semi-metallic pads I just took off my Monte Carlo. I last serviced the front brakes at 45k, the car now has 95k and it looks like the passenger side caliper was inoperative for most of that time. Despite that, the pads on the driver's side weren't worn any more than you would expect, even though they were doing twice the work. I expect that I would have seen at least 75k miles out of those pads had the calipers been working properly. Anyway, I just replaced those with Bosch ceramic pads, along with replacing both calipers and rotors. The new brakes stop the car very well.