Make sure to use the key included to tighten the cords to the needles, or you'll pay for it later! I think this is the issue with all interchangeable needles. Great quality needles, would definitely buy again!
I had wanted a 16 inch cable for my knit picks interchangeable needles but that was not an option through their company. One of my LYS ladies was nice enough to tell me that these cables were compatible with the Knit Picks system. They work great and I actually like this system better because everything is labeled much better but the needles are basically the same.