when it hits you can generate more hate depending on how much damge you did with it. if you do a 150+ jump, you can bet youre not gonna lose any hate. that goes for high jump too. the only sure hate sheader is super jump, but that one does no damage.
I often sub DRG for my PLD in Ballista. It's actualy quite effective when you use a great sword combined with this. I get hits up to 180 on mages with jumps :) I love this skill.