I had a bead chain fail on one fish at Odlum Pt at Hakai Pass. I was trying to drag a pig spring that was thrashing on the surface, down wind and down tide in rough water. I still prefer bead chains because they spin more consistantly than BB's do. BB's are fine if you only use them once. They don't spin well once those bearings get a little corrosion in them. I do test every swivel before I tie it to a leader. I just grab each end with a pair of pliers and give it a steady pull.