Just finished the book and it's a cracking read. It gets down to the nitty-gritty of the 3 Para battle groups operations in Afghanistan. It covers both the operations and the political dilemmas behind them. It puts the recent operation to re-capture Musa-Qaleh into perspective. It should become a classic. From a wargaming perspective there are plenty of possible scenarios that can be used from simple patrolling to all out Taliban assaults on the "company houses".
I got my copy from the library, but there's a good deal at Amazon.co.uk with plenty of reviews.