The subject matter, the origins of the Internet, is fascinating and the book does an acceptable job of covering it.
However, the delivery feels dull. The portraits of the key characters, and their surroundings feel like diversions, more often than not failing to bring the human dimension to the story. The book is nowhere near as engaging as Tracy Kidder's "The soul of new machine" or David Kushner's "Masters of Doom".
Technical content, and overall level of detail, feel OK at the start whilst covering BBN's involvement but generally fade away as the story progresses.