For me it's been hit or miss. I have two $14 Kayfun clones from FT that are fantastic. I have another all black one from FT that I thought would be the same manufacturer, but it's the worst of the fleet. The finish was terrible, and airflow through it was the worst out of the eight or so I have now, even after drilling it out to 2mm (which I do to all of them).
I had some success drilling out the center pin of my Tobecco KFL+ V2, so I may try that with that one as well.