Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Author Gives Support With His Books

This book is more than worth its price many times over. If you work in real estate, appraisal or are a student of the field, including those who are working on their GRI, CCIM, CFA and appraisal certifications, you will be pleasantly surprised by this easy to read book. However, what pushes Mr Tirones book well over the 'top' is that he supports the book. In this area several in our office have called the author over the past few months with questions. Mr. Tirone was courteous and extremely helpful; his support made the price of this excellent book a steal!I recommend the book for users of the HP-12C, be they students in college or professionals working on various certifications or designations.