When preparing for my medical school interviews, I purchased 3 of the most popular books on amazon, and found this to be the most useful to me. The format is easy to understand, and the content is concise but invaluable. The lists of example interview questions is extensive and thorough. Additionally, the book provides other useful advice, such as what to pack, what else may happen during the interview day, and what to wear.
In the end, much of this book (and all interview advice books) is common sense, if you really think about it. Of course everyone knows to get sleep the night before, dress professionally, and that they will be asked why they want to be a doctor. However, the tone used in this book made me gain confidence as I read it. I felt better knowing that I wasn't just guessing about how I should prepare - someone else thought that way too. In the end, although I didn't necessarily gain any "secrets" from reading this book, it was worth every penny to me for the confidence having it imparted to me.