Size matters?

Mtb, fat, and "holy crap" sized hubs. Building my second set of wheels with 9:zero:7 hubs. Bearing and freehub quality are second to none; highly recommend. Bearings spin for days (much better than the average high end hub) and have held up superbly. Freehub internals are much larger than average plus the pawl's give off that "not gonna bust me" loud clack/clack/clack. Tough, light, smoooooth.