Just to add my $.02, I had the axxis metal masters, and although they were great on the street and decent for AutoX, they were not up to track use, and I cooked the pads (cooked, as in when I pulled the calipers, the pads were actually disintegrating, and had the feel of asbestos, they were so soft). Bear in mind the metal masters are not billed as being appropriate for track use, and I was using the lower weight of the NX to harrass M3's on the track by diving deeper into the braking zones, not to mention the track I was on is known as a brake breaker
Darrin