buyology presents a few interesting insights, but mostly the narrative is marred by the authors irrelevant and boastful ego trip. Also - I find the book lacking in nuance. E.g. Lindstrom often reports that X has an effect on Y - but not how big an effect, and alternative explanations are not given much thought nor space.
Mostly the book fails because it does not tell us why we react in certain ways. In that respect the book simply shows us that brainscanning can tell us which advertising schemes works. But brainscanning can't tell us in advance how or why this works and that does not. Also the book lacks a discussion of how the brainscanning set-up is different from real-world advertising. E.g. It's all fine that mirror-neurons get credit for the ipod fad, but why only the ipod? Why not all other products?
A better book, with focus on the brain, would be A Mind of Its Own: How Your Brain Distorts and Deceives
. Also The Political Brain: How We Make Up Our Minds Without Using Our Heads
is highly reccommended.