I know quite a few of the researchers that were involved in reverse engineering Stuxnet and Flame - so I was able to watch the story unfold with a behind the scenes view - what's presented in here is a very accurate, and insightful view of one of the most important security discoveries in recent years.
Stuxnet, et. al. presented the security industry with a huge problem - and the implications are still being sorted out to this day. Government use of malware, and how the industry should handle it when discovered are topics that are still being debated on a daily basis. Kim does a great job on explaining the issues, and giving readers plenty to think about.
From a technical perspective, the book goes into enough detail so that those of us familiar with the topic know exactly what is being discussed and it's implications, while not going overboard and overloading non-technical users with incomprehensible details. The book has a good narrative style, while covering technical detail and including details on the sources for information. Throughout the book are footnotes that list source information, additional notes that explain context, or provide additional details that don't fit in the narrative telling - I strongly suggest that you read the footnotes, as they offer very useful information.
All in all, I strongly recommend the book, well worth it.