I run the AIM VPC on both my bikes. Both with built motors and the lever pull is reduced from the stock pull by at least 25%. As diverwes says, a bit spendy but a great upgrade.
However, I would not spend that much for a stock or Stage I motor. You can achieve the same result with the EZ pull ramp. More labor to install as you have to pull the clutch cover but will achieve the same light lever pull as the VPC. The HD kit is better than the aftermarket kits and if the bike is '07 up, it already has the EZ pull kit. Barnett also offers an EZ pull cable; not sure but I think they have a super slick lining that allows the cable to move more freely than in the OEM cables.
Both my bikes are old enough that they were not equipped with the newer Teflon line cables; not sure when they were an OEM item. The Teflon cables made a big difference in clutch pull as well.