they're fine, will fatten your tele nicely, especially for clean solo's.the cs3 has a tone control which is useful and was the standard for country players.i have the cs 2 which doesn't have this, but it's pretty much the same as the cs3 which i used to have.
there's better pedals around, (so i'm told), but for knopflery tones they do the job, are bulletproof and next to nothing 2nd hand.