So, I got these tires as replacements for the PS2s, and now that I've put some miles on them, I thought it would be useful to report back on what it's like to live with them for a while.
I've got about 4,000 miles with the tires, including some (but not much) track work, and the love affair is still in full bloom. Wear has been great, still plenty of tread left. I fully expect these tires not to fall into the 5-6k mile R-compound trap. I don't know about lasting as long as the PS2s, but it won't be a night and day difference in lifespan.
The grip just keeps coming. Braking performance is where it really shines. The feel of jumping on the brakes at 100+mph on the track, and just hauling you down for corner entry *never* gets old. Cornering is just as much of an improvement over the PS2. On a couple of occasions, I've followed a Corvette or two on the twisty roads around Austin, and the car will just stay with the Vette easily, even at close to 1,000 lbs heavier.
Noise isn't a problem at all, they still ride comfortably and quietly. We haven't exactly had monsoon conditions in Austin this summer, so I can't comment on wet performance, but they haven't given me a problem. It was wet on the track one day I was there, and they did fine in those conditions. Got a few nice drifts, and they were just as progressive and controllable as the PS2.
So far, I haven't found a downside, other than cost (20% higher than PS2s, give or take). If they get me to at least 9k miles, I just don't see ever going back to 'civilian' tires. They're that good.