There is nothing fundamentally wrong with them, no one has actually shown any practical difference between a clone and an original, if you read the original thread there are people posting that the reason they got a pixhawk is it came with connectors.
@dkemxr as far as i know there hasn’t been a 1m pixhawk since 3dr was selling dud chips, for some reason some clones come flashed as 1m or fmuv3 but they can all be flashed to the standard pixhawk firmware.