Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A disappointing book in most aspects....

I fully agree with the comments of "Collector". To be a useful reference/guide book for the general collectors, techniques on how to distinguish authentic and new reproductions are of great importance. But this book obviously fails to do so. Besides, offering a reference price for the collectibles are always misleading in particular for the volatile cultural revolution relics market. A "star" system according to the rarity of the items would be much more useful in this respect. If you are not interested in collecting CR relics, you may still buy this book to enjoy its colorful pictures though. No harm at all but no gain either!