Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't buy this book

Don't buy this book - it does not live up to any of its promises. Since I'm very interested in their topic, I actually did struggle on for more than 200 pages, but in the end I had to give up.The style is poor, and full of irrelevant detail and repetitions - the pages are real tough going. Much worse, the authors do not leave you with any doubt that they do not command their subject matter, they do not even seem to be sure what they are trying to argue. As regards physics, their ignorance is so deep so as to make one wonder how The University of Chicago Press could ever consider publishing this text.