what road fan said.

apart from the servizio corse from yellowjersey: i bought a set of three some time ago. they're ok for roundness, but flat easily. i've also had lots of trouble with sidewall damage on them, had to replace one from scuffing it in a gutter groove, and just literally popped my last one yesterday. fortunately nothing exploded until i was very nearly home (but i had just done 50 miles of climbing and descending in 40 degree plus heat). it was a spare that i had been running since i flatted my preferred evo corsa a fortnight before.

one flat bummer, two flats screwed (and 30 km to home going bump-bump-bump very slowly).