I had 2 sets...one wore out after 2500 miles of NYC racing/training (165#) no flats. The second set stranded me several times, front and rear, and are a ***** to get off of the rim so when you're far from home a real pain to change the tube. Then I decided to switch back to my maxxis training tires...they don't ride quite as nice and maybe i'd switch to the michelins for a crit, but they just never flat and i can't tell the diff as far as speed goes.