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

I just purchased this book last week and think is is an excellent reference for anyone looking to build jumps for use in a schooling show, 4-H event, pony club, or for the model horse hobby. This book explains very clearly what equipment is needed, what supplies to buy, construction details, and dimensions of each component of a jump. It has clear photos and excellent line drawings. The weak points of the book is that it does not explain what design details makes a jump safe or inviting. It is also vague on color choices that are tradtional for hunter and jumper jumps. The author does mention in the back of the book what books to go to for additional information though. As a basic reference it is terrific and money well spent.