Really good interesting book,there is a lot of rambling however for me, its not useless information but it's a bit excessive and doesn't really enhance your knowledge on the concepts in the book.
Key question. Will this make you a person who can influence people more effectively ? I'm not so sure, I guess if you took the time to really work some of the ideas into you everyday life then maybe. You will definitely have to WORK at it and think really hard as to how you can use the ideas because its not like a step to step guide, its more like a diary of his findings.
This book will make you more aware of things that influence situations however as in how to actually use them to benefit yourself not so much.
All in all good book. Could be condensed, longer than it needs to be.