I've read the book, as well as Influence. Influence is a far stronger book because it does a better job of describing the theoretical underpinnings of why the 50 tricks work.
Some of the tricks are really narrow and so they aren't all that useful themselves (e.g. to write post it notes and put those on interoffice forms and surveys for a better response), but with the theories you can make better extrapolations.
Some of the tricks are really narrow and so they aren't all that useful themselves (e.g. to write post it notes and put those on interoffice forms and surveys for a better response), but with the theories you can make better extrapolations.