Instruct: Classify Amazon reviews into positive or negative sentiment
Query: One of his best!!!

Congo is a good Crichton book in many ways. First in character development, where it gives us a good background of the people on the expedition. Second, there's Amy, whom I found very interesting. And third, the action scenes are described very well, even better than "Sphere." I would highly recommend this book to anyone who is a fan of Michael Crichton. This definitely ranks as one of the best books ever written. Step aside, John Grisham, Michael Crichton has the country in the palm of his hand!!!