Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: That's a lengthy one

There's no doubt that the author knows a lot about the subject. The book is full with anedoctal examples. They are so many that I sometimes kept wondering if just one psychologist could ever see them all. It's really a complete work, as the title claims, except that it's more a lengthy review than a self-treatment guide. Patients and families will certainly benefit from information, but for recovery they'll have to rely on real therapy - Penzel doesn't deny it, of course - or, at least, obtain a more appropriate "guide".