I agree with Matt, these are awesome bang for the buck track pads, but the cold bite sucks. I definately don't recommend these for autoX (or the street during winter). I have a set that has 1 track day on them, and they have at least 3/4 of the material left. The only thing I didn't like about the yellows is that they don't bite anywhere near as hard as other pads I have tried ... porterfield R4 (I haven't tried R4-S), ferrodo 3000.
Mike Warfield once told me that the PFC-97s were the best track pad he has used, and at the time they were only available for stoptech calipers, not brembos, so I went with the R4s, but I noticed last week that they are available for the brembos now, so I might try a set of them once my yellows are done.
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