Overall, an excellent book. The prose is crisp and really manages to synthesise so many aspects of the conflict into a rolling narrative. It's likely you will find yourself reading in 100 page plus chunks, which is pretty good going for subject material which could have been on the dry, academic side (I wish David Glantz would take note!). This book works even better (in my humble opinion) if you read as a companion to Ken Burns' "The Civil War" film documentary.
A few criticisms, however - the battle / campaign maps are UTTERLY useless - I don't think I have seen worse - minute, font size must be about 0.5, black, dark grey and slightly less grey symbols on a (you guessed it) grey background is not going to help anyone. Some of the tiny maps compound this by having even smaller map inserts. I know there's not a lot you can do with A5 sized books, but currently reading Manstein by Mungo Melvin, who manages to have clear, legible colour campaign maps in a book the same size.
It may be a complaint which a lot of US readers wouldn't have, but a larger scale map showing how the cities, rivers, states and valleys actually sit with each other in terms of overall geography would have been really useful, but I suppose you could just say "buy an atlas!".
Might be a bit on the niggly side, but the paper quality is really poor, too.
The text alone easily merits 5 stars. The presentation (which I am guessing isn't really down to the author) is pretty ropey.