Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Frustrating to follow, overly verbose,

I ordered this book hoping the first two reviewers were overly pessimistic, but boy were they right. This book has terriffic potential, but Travis does not stick to the chosen topic well enough, mixing material covered in different layers. It's a good thing I saw this and could overlook it...pity the novice hoping to make some sense of the SS7 structure. There's way too much verbage and not nearly enough illustrations and real-world examples. After finishing the book, I felt I was presented with a "gob" of information and a very weak understanding of it's true structure. On the plus side, it's probably the best textbook on the subject, but that speaks stongly to the need for another book, or major re-write.