as general rule then as above true "warped" discs are uncommon although it does and can occur.........more common is thickness variance or un-even pad deposits
PFC have extremely stringent QS standards as well as being one of the few (possibly only) people to carry out a full heat treatment process of their rotors meaning any issues are virtually 0%..........
far more common to incur problems by incorrect fitting, seized/damaged calipers or incorrect run-in procedure (needs to be specific to the MANUFACTURER your using not just your mate billy's advice
)
with any 2pce disc then we would strongly recomend checking the run-out of the hubs and discs upon installation as this can/will cause "warped" symptoms if out of tolerance
finally be aware of poor quality "copy" components used with genuine rotors as we have seen numerous issues due to poor quality material/machining processes used
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