So far I've only managed to put the alloy stuff in the rear as my lhs is out of the smaller bevel gears and I forgot to order more from tower so I'm having to wait to build the front stuff. As for what's in the rear I'm impressed so far. I immediately noticed a power difference with the alloy stuff versus the plastic, almost like the plastic components were flexing and absorbing some power. Now I barely tap the throttle and she'll stand right up on her wheelie bar. I've managed to flip her right over on her lid a few times so the power is getting down now. It will take a few gallons to judge longevity but I'm sure that it's going to hold up a good long time so I'm happy with my investment.