Instruct: Classify a review into positive or negative sentiment.
Query: Best history book available on the 911

The author really knows these cars. He's owned them, driven them, and even raced them for the factory.There's a huge amount of technical information, but its presented in a informative and well-written way. The chapter on engine development is worth the price of the book alone; every design change is described and explained.Perhaps the only critisism is that Paul Frere likes the 911 too much. The disasterious self-leveling suspension episode isn't really mentioned, nor are the many problems that have occured with the 2.7 litre cars in the hotter climates of the USA.Overall this is a great book; if you have any technical interest at all 911s, this is the book to get.