The ideas behind the book are good, but they're lost far and between the author's praises of the slip-box method. The amount of time spent explaining versus praising it is surprisingly low. Granted, it is a simple method, but the book would still do a good job explaining it at less than half its length. There are almost no examples -- the author does state some common pitfalls and that you need to trust your intuition, but at least one comprehensive example would have been nice.