If you have the opportunity try out as many as you can. I generally just use a shaft to jump (but that isn't really legal). If I had to recommend a jump cue I would probably recommend the predator air 2 but everyone has a personal preference.
Also it doesnt make any difference whether you are doing a dart stroke on a barbox or a 9foot table.
I don't have any trouble jumping balls on any table except Valley bar boxes, and I can jump either way with my Varney break/jump, except on Valley bar boxes. Its my understanding that your jump cue has to be at least 40 inches to be legal, let me know if that's not right.
I am interested in a "legal" jump cue for jumping on a bar box with the dart stroke only. What would you recommend?
Jacoby is the best I have used on the bar tables.

Has anyone tried the newer three part Jacoby? I tried a two piece and liked it, but thought I'd hold out for a Predator Air 2 when I've got the money. If the three piece is simply the same as the two piece but with an extension I'd probably opt for this. Anyone tried both?
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40 is correctI don't have any trouble jumping balls on any table except Valley bar boxes, and I can jump either way with my Varney break/jump, except on Valley bar boxes. Its my understanding that your jump cue has to be at least 40 inches to be legal, let me know if that's not right.
For the money, Jacoby is hard to beat.
I learned to jump on a Olhausen home table. That slate was thinner and harder to jump on. Also, the bar box cue ball takes extra effort (it could be in my head) to get in the air.