Dan,

German AMS tested two 997s some time ago. One with standard brakes, other with PCCB. Test was very extensive country road use, track use, wet road use and all measurements.

PCCBs were better at track use, marginally better at country road use and not so good at wet road use. PCCBs had slower reaction time then standard brakes. They measured it and they claim that sometimes you can even feel it...

Also standrad brakes were easier to modulate at low street driving speed then PCCBs.