Apparently, a lot of the Vudoo FTF issues being reported are being caused by the slightly differing height positions of the magazine catch/release in the various chassis and stocks the rifles are being installed in. I don't see how this is a Vudoo problem.
Mag seating heights do cause problems, but I don't think it's the issue here. Despite the author of the video insisting he's seen all the instructional vudoo mag loading videos and expresses he knows how to load a mag - 8:35 into the part 1 video shows him depressing the follower using the thumb assist, and dropping rounds loosely into the mag. Vudoo specifically warns against this, because it causes loading issues. It is more prominent in the 15rd aluminum mags, but affects the polymer ones as well. If he's watched the videos, one can only assume he's purposely introducing error to help sell his point.
I'd recommend taking the series with a grain of salt. Of course, all things manufactured are going to have the odd dud - but this guy isn't informing people of defective rifles, he's selling his service and trying to convince people they need to pay him to rebarrel likely perfectly fine rifles. The issues with the rifles could have been described in a 10 minute video - instead we have an hour showing us the great work the guy does.
As a personal note: 15,000+ rounds later (after solving the mag engagement issues in my chassis), I can count the failures to feed on one hand, and failures to fire are even less. I do however feed it a steady diet of SK/Lapua. I won't comment on his head spacing issues beyond saying Vudoo very explicitly says their rifles are built to shoot SK/Lapua ammo, and likely has set their systems up to shoot that ammo reliably and accurately. Any adjustments made to make other brands shoot more consistent at the cost of reliability of their suggested ammo could be seen as a flaw in their system. I certainly wouldn't want my rifle to perform worse than it does right now just so I have the option to shoot Tenex. His test targets after the rebarrel are impressive, but I've seen similar results from good lots of S+, RM, LRM, and CX - all of which are half the cost or less than Tenex. This from my "production" rifle that didn't cost an additional $1k(?) to rebarrel.
Despite my disagreement with the premise and results of his videos, I did watch them all and did enjoy seeing the process. He's clearly a pretty good gunsmith - it's too bad the videos came with the clickbait type sales pitch.