Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: A popular extension of Personality Types Revised Edition.

Done in something of the format that made The Artist's Way such a popular success, Don Riso and Russ Hudson have made a fine, though busy, addition to their body of work. For me, nothing will ever replace their extraordinary accomplishments in Personality Types, Revised Edition; it will remain the "highly recommended" systemtatic bible and centerpiece for anyone truly studying and applying the enneagram in depth as its horizontal and vertical revelations unfold in an increasingly integral world. I found the omission of an index disappointing, but have nothing but gratitude and respect for anything Riso and Hudson add to the enneagram literature with their incomparable precision and vision. I don't know if I'd call this the "complete guide" to either psychological and spiritual growth or the nine basic types, but -- bravo, nonetheless.