I've bought several sets of these needles and for the most part they have been lovely to work with but a pair I had used the longest broke at the needle and cord junction. A fluke? Maybe, we shall see, as I have three different sets, as well as, other kollage needles of the same type used in the Stitch Red campaign.
I own the fixed circulars as well as sets of interchangeables and they are all of the highest quality. Even the finest yarns glide past the unions. After learning Cat Bordhi's two Circ method, now I have a reason two buy two of every size!