Had my first puncture after 875 miles commuting on some pretty crappy glass strewn bike paths. Incredibly I was about 250 yards from work so no dramas. No bicycle tyre could have withstood the chunky spike of glass that caused me to puncture. Unfortunately, 875 miles has NOT softened them up at all and getting the tyre off to change the tube was hard work and would have been a nightmare at the side of the road with cold hands.