This is a pretty lightweight book, and self-indulgent as well.
Most people will learn very little of interest that they probably don't already know. The possible exception to this is facts about the author himself, which are sprinkled throughout the text. Did you know he has an "extremely young, boyish-looking face"? Or that he has "raked-back blond hair"? Do you care?
So anyway, what I have learned is that we don't remember most of the advertisments we see; and we mostly buy stuff for irrational, unconscious or emotional reasons. And by scanning people's brains, you can see how different parts respond to brands and logos. This gives you a bit of insight into hard-to-explain human behaviour, such as smokers who smoke heavily despite the dire health warnings on cigarette packets.
Other amazing things I've learned include the fact that the smell of coffee makes you want to drink coffee.
As far as the book itself goes, Lindstrom fails to produce a decent narrative - it's just a jumble of loosely-connected facts, heaps and heaps of padding, repetition and irrelevant personal details. Plus I spotted a couple of dubious-looking "facts" which I easily found to be incorrect with a quick search of the web.
And as for the author himself - well, after a while he just comes across as egotistical, if not mildy delusional. He's just puffing up a few fairly obvious bits of science into a book he can use to promote his own personal brand.
Oh, and he claims to be responsible for egg yolks being bright yellow. I kid you not.