Just finished a 2300 mile cross country on PR4's. It was in the 30s and raining for most of the trip. One leg was below 30 in freezing fog, that got my attention. Mostly freeway but a brief technical segment on old Rte 66 between Needles and Kingman.
1. Tires held up amazingly well. Other than being well run-in, there is no visible wear in the front. The rear is a teeny teeny bit squared off. Mighta shoulda run the rear at 42psi instead of 40, I was riding pretty heavy.
2. Absolutely amazing stickum in cold rain. I don't think I could have asked the tires to do more than they did. Absolutely no indication of hydroplaning, although I kept it below 60 when it was raining.
3. Hard to say how they did in the twisties, I was carrying a lot of weight in the rear and the road was in awful condition. I didn't push it. (If you've been on that road, you know why)
I dunno that I would choose this tire for aggressive riding in good conditions, among other things the wear pattern on the PR3's that the bike came with was really weird, leaves a high ridge of hard rubber that makes the bike really squirrely. But for the open highway, my jaw is hanging open. Just can't believe how well these things did.