A must read I think for ELTs. Basically, I’ve found the chunking approach to be very useful in the classroom for many pieces of language, and this book is full of ideas for how to do that. This book has definitely changed the way I teach.
But above that, it’s just fun (for me at least) to read a book that wittily exposes the absurdity of orthodox ways of doing things. Lewis has a very enjoyable prose style and can be quite funny. A “good read” in the traditional sense, which is an accomplishment in itself for an industry book.