Great book. Very interesting stuff that you've heard Simon Phillips, Vinnie Collaiuta, and the like do forever. this takes the "mystery" out of some elusive concepts and gives you a systematic way to develop the tools. It's kind of like the Chaffee material in that it is very well laid out, systematized, and organized to go through all (or most) of the permutations. Especially great if you're disciplined enough to go through it a little bit at a time b/c it's not easy stuff. It can give you a bit of a headache. Once the concepts, feel of the displacements and modulations, and application of the material within a musical context are together, you're going to impress a lot of people.