the proof is pretty cut and dry as they only seem to sell cheaply made chinese garbage at inflated prices, you can find the same junk on ebay for half their prices they only sell CHEAP KNOCKOFFS.
you can see in all of the major BMW forums more and more peeps are reporting problem after problem some of which resulted in crashes and injuries but all report sub par products of shitty quality.
choose who you support carefully since some only care about profits and disregard the quality and your safety.