I've used Repco/Axxis Metalmasters on all my BMWs and Porsches in the last 10 years or so. I think they are great. They don't squeek, stop as well or better than stock, are easy on the rotors (I've only replaced rotors on one of my cars, once), and, best of all, are almost completely dustless. Not 100% dustless, but I'd say they make about 2% of the dust of stock pads. A huge difference.
I will buy some for my C the day they become available.