Depends on where you set the idle engagement point and how you set the clutch up. I am 90% done with installing my new z start pro now. I think it would be fantastic for hill climbs, the bike wouldn't stall out at an Inopportune moment and as long as you apply light throttle it will keep the bike engaged in whatever gear. My thoughts though, I haven't riden one but from all the reading I've done I expect that.
For the record rekluse calls for 6 tc balls to operate per their suggested engagement. So I'm running 6 even though I have seen people around here saying to run 12 tc balls.