If anyone has ever doubted Webber's (and apparently White's) mastery of military science fiction, then this novel (as well as it's predecessor Stars at War) should prove them wrong. Stars at War II is actually two novels in one, The Shiva Option and Insurrection.
The Shiva Option picks up where In Death Ground (the second novel in Stars at War) leaves off, the Grand Alliance and the Bugs at a standoff, both licking wounds and trying to regroup. It is intense, unrelenting, and filled with incredible battles. Though the final conqueror is probably easily anticipated by most readers, the "how" of the journey they take is intense and full of twists and turns. It is definitely hard to put down.
Insurrection takes place several hundred years after the war with the Bugs, and basically follows as the fringe worlds separate from the Terran Federation. Interestingly enough, this novel, unlike the first in the book, actually brings you down to focus more on individuals, as opposed to how The Shiva Option focuses more on the war and what it is costing to win or lose.
Overall this is an excellent book. It is huge - finishing at almost 1040 pages! But well worth it. And when it is all said and done you'll be asking for more!