I ran it without the booster and brakes were like really soft, so booster and all was well. And as was said above protects the crossover, which has been twated once before so win win. stacker's = essential. I had a bad back for ages with the hope 10 degree rise stem and a set of fatty forks. Got the onzas and used up all the hope stacker set and felt natural so I'm sticking with it for now. Ill poss be changing bike soon any hows when i get bored of it. Cheers for the replys.