I have a set of these and the joins at the cables (for some of them) are a little rough. Mine aren't horribly bad, but there is some interference there. I haven't tried smoothing them down any and don't know if that's even possible.
The main thing about this needle set is that the cables are rather stiff, so if you're planning to use them for magic loop, that's probably not going to happen. For regular circular knitting and for knitting back and forth, they work fine.
I would be willing to sell you mine if you're interested (I've used mine some and really enjoyed them, but now I use other needles much more frequently).