As someone who has worked within the UK advertising industry for a while, I found Simon's book to be a perceptive and very entertaining read that made me cringe with self-recognition. The suggestions, from what to wear to whether or not to present work, are forthright and well justified, but presented in such a way that you find yourself speeding through the whole thing without putting it down. I have lent my copy (sorry about the lost sales, Simon) to several people who expressed an interest and they all found it just as enjoyable as I did.
As there are no similar books out there, I think this does a great job of pulling back the curtain and showing us behind the scenes of this fun and frustrating industry. If you are thinking of creative advertising as a career, it's indispensable. For the rest of us, who have already 'made it' (to a greater or lesser degree), it's a great advanced primer from someone who's won every award going and bought the (ironic) T-shirt.