Proactive isn't in the same league as the ZX2.
Dont sweat the stutter peformance reviews on this site, its listed because its the ONLY MINOR issue some wont notice others are picky.
Proactive geometry is poor no matter what you do with the shocks when it compresses the track loosens and you will fight rachteting, tighten the track and you fight slide wear, add anti-rachtet drivers and a few other mods to the skid and you might have something that rides mediocure.
The ZX2 turns the sled into a performance beast. You will never be sorry with how it performs. Its almost better then adding boost!