Don't buy it based on the hype, like I did
It's very nicely constructed, soft-bound, glossy pages, full-color. There are not a lot of techniques and too many of them are not "BJJ" but standing JJJ self-defense stuff. The technique description are not as detailed as I expected. The techniques are grouped by belt, but not too well IMO. Based on that, I wouldn't put too much weight on these being the "most important" either.
Disclaimer, I haven't gone through every page as of yet. Definitely try to check it out before you buy it.
It does make a nice coffee table book.
- Kyle