Generator concepts are in bite size chunks and easy to follow, yet not so easy that they bore the reader. The book follows a natural progression in complexity and will be usefull to developers of all experience levels stepping up to the Generator plate.
The level at which the author's stand in the developer community gives them the opportunity to bestow their knowledge in "we know it all" manner, but instead they maintain a humbleness that says "hey, we're just developers like you who've had a lot more time on our hands."
Chock full of all the essentials, and the non-essentials, this book is a must have for the Generator developer (or the developer wanna-be) and looks to have a long shelf life.
Chris, Phil, Mike-nice work!