Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not up-to-date!

This book is from 2001 so it is definitely not up-to-date. In one table, it compares 25 different companies that offer payment options on the web but only 4 or so are even around. So I'd be wary about paying $88 for information that may not be too trustworthy. Seems geared more towards academics than professionals.