I must admit to being pretty underwhelmed by this book. I've read a few books on influence / persuasion / propaganda, and having done so this was a bit of a waste of money.
Don't get me wrong, if this is your first glance at the subject then you'll find many of the short explanations quite interesting, though I'm not sure that its style will peek your interest to read further, which would be a shame as there are some absolutely excellent books on the subject out there that give a far better & more engaging introduction to the field.
If you just want a book to pick at on the train this is more for you, but if you'd really like to understand the subject better to begin with you can't really do better than Robert Cialdini's, 'Influence:The Psychology of Persuasion', and if you want a more useful day to day short read buy, 'How To Outnegotiate Anyone (Even a Car Dealer!' by Leo Reilly.