My experience of Carbon Ceramic brakes on my Boxster was a very positive one, speaking as someone who managed to boil his brakes on every track-day I did, it came as a very pleasant surprise to me that I could brake much later and much harder with the CC's in fact no fade, no wear, no dirt.
Only downside is if you landed in the kitty litter around the edge of the track the stones could ruin them. I spoke to a few die hard GT3 Porsche owners who had all swopped out the Carbon Ceramics for steel rotors for purely that reason. They are very good but very expensive to replace.