I'll let you know all about the PR3s soon. Just got mine put on Tuesday. They feel great so far. It is like a new bike with the change over from stockers which went 10,500 miles. I just put about 600 miles on the PR3s since then. They love the corners. Maybe too much. Waiting for a big rain to test the water shedding. Should be interesting.
I too almost hit 17,000 miles on the PR2s so my tire mileage should give you a good idea of what to expect.