I have broken with my playing cue which has a Kielwood shaft, no better or worse than other LD thinner playing shafts I broke with. I would not get a break cue with one, the drying out of the wood must make it more brittle and lighter than normal maple. Really the only benefit of the Kielwood is a bit different hit feel, it's a bit lighter and it looks nice. None of those are any good in a break cue.