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There are cheap pattern parts and cheap pattern parts ;)
Nower days it feels like a mine field in parts buying. For example I like EU made purflux filters, yes I cut old filters open and look. They are OE suppliers for a lot of euro manufacturers PSA?renault/Nissan. every so often they become hard to source. They are occasionally the GSF bargain brand.
I try and use a decent factor, not random off the internet. I then try and specify brand and place of manufacture. I doudt you guys would remember the fram filter fiasco of non EU or US filters.
Then there are fake parts and more common than you think.
I had this - new discs on front warped after a year. Garage reckoned it was due to previous owner using cheap pattern parts and not BMW.
Current OEM set are 10k in and perfect.