The basics of NLP are covered very well in this book. What I found particularly interesting were the approaches to visual and other cues in establishing rapport and understanding responses from clients. Also the methods for dealing with phobias and 'reframing' to handle well-established but inappropriate habits and behaviours.
There are many good pointers for intending therapists (or those about to put the points into practice). The key one must be that there are no 'difficult clients' and the glaringly obvious observation about changing an approach if it does not work. So obvious few therapists do it.
Being in seminar notes format, there is some distraction to the reader in trying to tease out the main points being made, so be prepared to spend time in itemising steps and going back and forward in the text to get the meaning.
There are three main chapters in the book, which is a bit on the long side to keep the reader's attention. The fact that there is no index and little in the way of contents (due to the fact this is a seminar) makes for some difficulty in cross-referencing or 'diving in' to read something of major interest. If you want to return to a specific topic it's best to annotate the book or make your own index up!
By contrast the more complex 'NLP Workbook' by Joseph O'Connor (Harper Collins) costs £1 more but is far and away better in terms of practical understanding and includes exercises. This book is carefully written and has an excellent contents section and a full index.
I would say to buy 'Frogs into Princes' if you want the fundamental NLP straight from the original authors. Much of it is conveyed by the comments and asides in the lectures, but be advised that a seminar is not the same thing as reading a book.