Originally Posted by Andrew R Stewart

You've discovered the dark secret of coated cables. the coating can, and will, rub/scuff off. I find the biggest advantage of coated cables is the extra profit they can make for the shop. "Looks different, must be better".

Really cables should be serviced/replaced periodically so i don't see any need beyond a point in their fanciness. (And this from a guy who rode the original Gore gear cables for years) Andy.