I have used a variety of circular needles, but my recently purchased Colonial circs have by far the best cable of any I have tried. As I am knitting with them, I never think about the cable. It never calls attention to itself in any way. It is so perfect, it's as if the stitches just go into limbo once they are off the needle. The join, also, is so smooth you are never aware of it.
Right now I feel as if I will never buy any other needle (except for Addi lace needles, and if Colonial ever makes lace needles I would switch on that, too).