They are good. I have the PR 3 on my Street Triple. I don’t know how many miles on them, since they came with the used bike, but they look still brand new after 3.2K miles by me, with 2 full truck days. And I know the previous owner did track days too, unknown if he did on this set. I can’t tell any wear on them. For even very aggressive street use, they are the best out there.
However, on a bike I track, I would go with a much less lasting tire, next time comes. They are great, but I did feel them lose traction, front and back, a couple times at the track last time. I’m not blaming the tire. I just want a softer semi-track compound for the track, that will probably last 3k total, lol. For street and moderate track use, I admire them. It is a marvel a tire with such good grip will also last over 8k miles, from what I have seen.