I have read 4 or 5 books on quant interviews and I have done well when interview time came. This is a good one. The questions are meaningful and require you to think them through. The solutions are written reasonably well.
The downsides are the following. If you have read the book by the author on mathematical finance (you should at least check it out because it is a good textbook), the chapter on option pricing will be just straightforward revision of the material presented in there. On brainteasers, other books are probably better than this one. The author also adds some "further questions" at the end of each solutions which in many cases are difficult and it would be helpful if he also proposed solutions of those.