My cossie had K-sports at the front when I got it, 6 pots I think. I sold them and got a std kit, as I'm never going to break much past 300bhp, so they seemed a bit overkill...
Good points I noticed were that the calipers hadn't seized although the car had been in storage for quite some time, and the operation was smooth and linear as standard. Never drove them at the track, so can't comment on the fade - but overall quality seemed impressive for the price.
On my usual track even the main straight barely reaches past ton, so the standard brakes are still enough for a 300bhp 4x4, which is nice, as no-one ever made sharktooths big enough to fit anything better...