This is a must read guide, as well as providing a sample of each exam and model answers. The guide then goes into great detail on why certain answers are the "right ones".
This guide gives you so much additional background information that will help in the exam.
Positives:
+ Prince2 foundation exam £195, Practitioner £360. So putting this into perpective this book is not bad value.
+ Authorities and definitive answers, with a great deal of explanation.
+ the sample papers cover a wide spread.
Negatives
+ Could do with more than one sample paper for each