Gabriel,
I was actually waiting to hear from a luthier about this process. I was a tool and die maker for years working by hand and with CNC machines of all types with tolerances regularly in the .0001" range. Looking at the accuracy claims for the Plek machine, they appear impressive but are actually pretty coarse by todays automated QC probe and manufacturing standards. Scans to within +- .0002". Fret dress within +- .0004". But then again, for our ham fisted guitar playing, it is more than adequate. However, like many processes, you are only as good as your weakest link. Nut cutting is +- .002". Hell, I could get closer than that (and I have) eyeballing a hand cut on a nut much less using a simple dial indicator to check progress. Just this alone could have significant impact on string height if automated cuts are at opposite ends of that tolerance. Am I trashing this process? Absolutely not! What a great piece of engineering and application - AND the whole process takes just minutes! For production and the final product, that is amazing! My toolmaker self is geeking out. However, I always wondered if a competent luthier could meet and even exceed what the Plek process is promising. I know I've done lots of hand work on stamping dies that were well within this realm of tolerance. It sounds like Gabriel might agree. I also wonder if a competent luthier could do a few tricks to make the guitar more adaptable to different string gages and even environment? I'll let Gabriel chime in on that. The difficulty may be finding the "competent" part. What is the cost for a Plek job? I guess there are stages in the process so the price may vary considerably? How does that compare to the price of a manual job? Again, I am not trashing the process or saying those who have paid for it have made a mistake.
Jim