Got this as an Xmas present from my brother yesterday, and just finished watching it.
It's really interesting, as a lot of it focuses more on his practice habits, particularly regarding his jazz studies, and how he explores chord voicings, and applies jazz-based thinking to his writing in Helmet. There's a also a big section on effects, which is really fascinating to watch, especially the part where he demonstrates a bit of music he did for a filmscore, where he orchestrated a guitar part that was most just swirls and feedback from his modulation effects. He's also got a really interesting way of using a wah pedal to generate feedback and overtones while he's playing.
At the end there's a four-song studio concert by Helmet, which is great viewing in its own right.
The only thing I would have liked to see is a section on how he approaches rhythm in his riff-writing, as there wasn't really anything on that.
All in all, highly recommend it!
I've never been really into Helmet, and didn't think he was as schooled a guitarist as this hints at. Is there some jazzy goodness hidden in Helmet that I haven't heard?