My kit has the ZR1 pads...they are great on dust (i.e. no dust), initial bite is great, BUTTTTTTTT, if you have a severe emergency, you SLAM the shit out of the brakes, they reach a point where the increased pedal pressure results in no more stopping power. No typically this would be fine, except that point, isn't as aggressive as it should be. Honestly i feel like my wife's Mini stops harder at the point of max effort. I am stopping short of saying that these pads are a serious liability because I don't want to be that guy...but it's scary for sure. In short, I do NOT recommend the ZR1 pads.