Originally Posted by Argonaut

I used a set of HP+ on the rear of my car for about 7 track days and 3-4 months of street driving. They worked pretty well. I then switched to HT-10 on the rear. I have to disagree with some of the posts above - my experience was they do not "eat" rotors. At the end of the season my rear rotors look great. The first several track days I kept a record, measuring the rotor thickness with a caliper after each event. I didn't see any change, maybe over the course of a season I would have but its so minimal its not worth worrying about. Now on the front, its a different story. The problem will not be "eating" or wear, it will be heat checking. You will crack the rotors long before you ever wear them out. Take a look at this picture, this is what happens to front rotors in just a couple of events. It gets much worse until eventually (within about 7-8 track days) you will be able to catch your finger nail on the cracks, then its time to replace. Also, I ran HT-10s on the front (harder pad than the HP+) and I thought they were just fine on the street, a little noisy and dusty but I didn't have any issues with cold stopping power.