A little intimidating at first, I was overwhelmed by the scope, kind of like seing a joseki dictionary for the first time. However when I approach it as a book of problems it is totally readable, and useful.
There are lots of good tesuji in this book. They are well explained, and sources are cited. I look forward to reading Volume 2 (although not right away).
You're meant to have the choice to read this straight through or treat it as a problem book, but I think it would be hard to really do the latter . . . the top of every page has a title that strongly hints at the solution: "atari," "attachment," "push through," etc. The book is very well organized though, with sections on tesuji for separating, sealing in, making heavy, etc. The writing is also illuminating, with strong imagery to help understanding: one move sends a single mounted warrior, another is a prison inmates' rebellion, etc. I'll definitely check out more books by this author, one of the great players.