Mich
PR 2's and they have done plenty of miles. (4,000+) Had a couple of punctures- according to the tube- but the tread on the front was still good. But checked last Saturday and I had 5 x 6mm splits in the tyre. One of which was causing a bulge on the rubber. Didn't take a chance and bought a new tyre. Glad I did as I decided to investigate the bulge with a screwwdriver and the cut was through the carcase. Took the tyre off and internally it was damaged.
It was the same when I was mountain biking- but you get confidence in a tyre- Just hope the PR3's are as good as the PR2's