This book was quite useful for me, as I could not view the specs while configuring my Wanzer. The screen text was far too small to be viewed on a non-HD set.
This book lists all of the specs of the current Wanzers and weapons, but it does not include the download packs that are coming out now.
The maps can be useful, as well as the locations of jammers and detectors.
The combat strategies, however, are far from useful, and often just tell you to keep firing until the enemy falls.
You do not need this book to complete the game, but if you want to get everything done 100%, you will find it handy to have around.