I have 1 cst because it was the cheapest tire at my LBS when i needed it, which happened to be when i was broke. mine is white and it holds up like you would expect, the contact surface gets grey and nasty, but the sidewalls stay pretty clean. I have been running it for about 1.5 months of commuting 10miles a day and have yet to have a flat **knock on wood**. although i did get a pretty good sized gash in it, i believe it was from hop stopping.