I've jumped a lot with my z2 shaft, but it got ruined as a result. The foam inside got knocked loose and is rattling. Also, full ball jumps with that particular shaft (and a full cue) are very difficult and IMO only possible when balls are ideally placed. It is, in my humble opinion, the most difficult shaft to jump with ever made. If your technique is sound, you should however be able to jump half balls etc easily. The light front end is what makes ld shafts so poor for jumping. It seems like a lot of energy gets lost as the shaft deflects away in these "prolonged" contact situations. It's the only explanation I can come up with that makes any sense to me. If you want to jump with these kinds of shafts, you need to hit less of the ball than you would with a proper jump cue or traditional cue. You need to hit the ball with more draw, as close to miscueing as you comfortably can, is what I'm saying. If you try to move towards a more "centre" ball hit (through the core of the cueball), you're going to have trouble. If you can do that with a ld shaft and a full cue, you certainly know something I don't, or have an extremely powerful stroke.
However, masse shots seem to work fine for me. I don't shoot the extreme "big" masses much in game play anyways, but even they can be shot with good technique. For normal masses I haven't had much trouble with ld shafts.
