In a word: exceptional! I don't play many real time games, so a good strategy guide is a must for me. This one is really, really good. I wish the author wrote for some other games I foolishly bought.
And now the rant: Most strategy guides I've purchased in the last 5-6 years are not worth the price of the paper they're printed on. And a lot of games that don't have one, truly should. I wonder if anyone else has noticed how rare good, clearly written, complete, illustrated game manuals have become?
Anyway, if you're thinking of buying this guide: do!