Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book is great!

Allthough I did not purchase it on Amazon.com (I bought it when it came out in '94), I recommend wholeheartedly that you buy it now! It's THE best book of it's kind, and will do you know wrong. There are a few errors, but only experts on the subject would locate them. Allthough the culture is changing in Japan, most of this holds true today.