I've never had an energizer kit, they are quite spendy.
with a WJ and a diverter, performance was nearly the same as a berk with diverter.
I guess it depends on your goals, too
I'd buy a used berk and swap out the WJ, before getting an energizer kit, but thats me.
I'll keep my WJ all WJ
71.8mph ~475 hp, WJ
Dan'l