I have purchased a total of 3 brake setups from Parts For Scooters. Of the three, one works fine, one had a bad master cylinder out of the box, and one had the pins that the rear caliper slides on fall out.
Parts for Scooters replaced both of the faulty units with no issue, but just keep an eye on them once you install them to make sure everything is still working/attached properly. Wasn't too much fun to find out your brake fell apart while bombing down a dusty road.