I have a couple of sets of Addi, but they are not interchangeable, so not much help.
I've also had a problem with the KnitPro Zing needles, and they are awful. They undo, and they catch on the yarn. I bought them because I have a set of basic KnitPro interchangeables and have had no problem at all with them, just plain aluminium, no fancy colours.
I replaced the Zing interchangeables with HiyaHiya, and they are better. But, the screw system is different to the KnitPro, so they can't be swapped around.
Hope this helps.
Jessie