Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very Disappointing

When I got this book, I started looking through it, and I am very disappointed with it. You would think that something that says it is a 'Tech' series book would have some performance data. It does not. The closest it gets to 'Tech' is several 3 view drawings with dimensions on it.Overall, I rate this as a do not buy. Very disappointing.