I have a pair that I used for about 2200 miles. For the first 2000 miles or so I was very happy with them, but then all of a sudden I started getting flats left and right. They still had enough tread left that I kept them, and just yesterday (after letting them sit in the garage for a year) I mounted them on my single speed wheelset. A survey of feedback on this site over the years indicates that the biggest problem people have is with sidewall damage. The sidewall on one of mine has a few broken threads sticking out, but it never seemed to cause any problems.