Stay away from Teflon-coated cables. The Teflon soon rubs off the inner cable on the inner radii of bends and jams the cable enough to make changes sluggish. There is no finer quality cable than Shimano or Campagnolo. The latest Shimano cable, it may well be the SST type, has a polymer winding around the steel cable. This is more durable than Teflon coatings, but can fray at the ends.This doesn't affect shifting though.