The structure is well positioned in a number of points and the content is scarce in some places to. Certain approaches to the mysteries missing with a detailed description. Likewise also contains errors, the not likely to be. Piggyback solved the easier and really did everything with pure, you need to know as a player. The Guide is recommended for more X-2, since it is not quite enough for X. For all German players, I advise that your solution of Piggyback books aside Take, if problems should be.
Actually I find the guide well done and forgive 4 stars.