James,
They're not really known for jumping but you can jump with it. Right now I jump with a phenolic tipped shaft and I find it's a little easier but not as controllable. With this OB it's easy to stop the cue ball on a jump shot.
I jumped with a friend of mine's Stealth AT-1 with a leather tip, and I would say the OB Break shaft is pretty comparable as far as height of jump and controllability. It's also really smooth.
Royce is working on a solid break shaft like the new OB Classic with the short ferrule and he should have that shortly. I'm thinking that would probably be the best of both worlds for a jump/break. It's more rigid on the ferrule end of the shaft - so I'm thinking it might be a little better for a jump/break.
The OB break shaft is great for breaking because it's very forgiving and gives great cue ball control. It really is a thick LD shaft. That extra bit of control helps a lot because the break shot exaggerates any off center hit. I'm sure, like me, you've used a stiff heavy shaft and every once in a while almost miss the entire headball because of cue ball deflection. I'm experimenting with mine right now and so far no missed breaks.
Chris