Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Huge Undertaking, But Worth It!

This is a masterpiece, hands down. It took me a few months to read it, but I wanted to take my time to get something out of reading a book of this length and breadth. It was worth the effort. This is the best overall account yet that I have read about the Third Reich - it's a must have for any serious World War II buff of the European Theater.If you are really intent on learning a great deal from reading the book, take notes, especially of all the names and abbreviations; it can be a bit hard to follow at times.A true masterpiece.