This book is indispensible to job hunters in any profession. Once you have read and understood (and understanding is vital) exactly what interviewers are looking for, answering any question they throw at you is easy.
The key concepts in the book are centered around preparation and persistance. I whole-heartedly agree. Particularly, you can never do too much preparation.
I've used this book before every job hunt and everytime I've got multiple interviews and job offers. In fact, I'm often disappointed that the real-life interviewer's questions weren't nearly as tough as those in the book! You end up having to lead the interviewer to tougher questions in order to get your points across.
Criticisms? Well, yes, the dressing style guide is a little out of date The general prinicples are fine, just take the specifics with a pinch of salt. Also, the author's advice is sometimes a little pushy, perhaps because the book was originally an American publication. In the UK, a little more diplomacy might be appropriate. As always, one should always apply one's own judgement and style in such matters.
In conclusion, a fantastic book - I wouldn't be where I am without it.