The game itself is superb, and this guide complements it perfectly. Whether you want to play through the game as thoroughly as possible with its guidance, or you've already completed it and you want to go back through it in greater detail, this book provides all the information you need, and presents it attractively and practically. The game's missions are all walked-through and mapped, along with their Challenge- and Mission-Mode details, and the lists and tables of weapons, abilities, items, synthesizing, enemy stats and so on are quite mind-blowing if you like that kind of thing. The detail is immense, right up to the stats of every possible weapon "Gear" as transformed for each playable character.
All in all, brilliant and eminently useful. Even if you can play through the game perfectly well without it, it's still worth having.