4000 miles so far on my Gatorskins. I got a series of 3 flats (slow leaks, flatted o/n) in quick succession, turned out to be a sliver of glass just barely poking through. I figured it out by carefully matching the hole in the tube to the location on the tire, wish I'd known about the cotton ball trick. When I removed it I went over the whole tire and could not believe how many other glass and metal shards were embedded (but not poking through). I am extremely happy with Gatorskins, can't believe any other tire could be much better in terms of flat resistance.