Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: This book was informative, but at times it was long-winded.

The book had enough facts, figures and information to be a valid source of knowledge for the topic, however it was at times hard to follow. The statistics were thrown out at the reader without any preparation or easing into the introduced subject. It went from one topic to another without a smooth transition. Their transitions were choppy, leaving the reader feeling unsettled and at times, confused.