i actually had that exact one on my banshee when they first came out.
it changes the folcrom point of the pull.
it didnt do much for that beast barnett i had in it at the time, i eventually put lighter springs
on the clutch, i might of even had ground down the springs a bit, i think i did, to make them a bit shorter.
if your paying for it, save your money. get lighter springs, or a different clutch lever/ and mount that gives you more leverage.
i actually changed the one on my raptor to one off a sporster, i figured if it can pull the clutch on that beast it would be good for the rapp. and it is, makes my pull nice and easy