Just finished this morning.
I was telling a friend that this book is like a Clancy thriller, except that it doesn't take 400 pages for things to warm up. Once the action in this book starts, it's non-stop to the end.
As others have said, the hyperpace of the book won't let you put it down. I'm interested in reading a second time to do more thinking and deciphering.
Highly recommended reading. Get a copy.