This was the third time I've autoXed on these tires -- the last two points events, and the instructor runs at the PDS.
I'm not going to tell you that the Pilot Sport 4S is better than the RE-71R. It's not, if you're comparing new tires vs. new tires.
But having driven both in anger now, I'm going to say that Pilot Sport 4S tires on their third event are probably as good as RE-71R tires on their third event. And examining the tires after three autocross days, they look absolutely amazing. Plenty of tread left, no strange wear patterns, no chunking, nothing worrisome at all.
Basically, for a 300 treadwear tire, these things are AMAZING. If you want a second opinion, check out Tire Rack's review:
https://www.tirerack.com/tires/tests/te ... p?ttid=223
What We Liked: Does everything asked of it at a very high level.
What We'd Improve: Nothing.
Conclusion: We are genuinely impressed.