The premise of the book is that metaphor is everywhere, is unavoidably built into our communication structures, and is both the natural output of our brains and the natural input. Metaphor has numerous side-effects on how we understand things, both good and bad.
This premise is well defended and believable. But if you already believed that, this book is frustrating. I wanted to know more about the side-effects of understanding things via metaphor. This is covered, but slowly. The book is more full of examples than ideas, and it feels constantly distracted as it flits from example to example. I kept reading for the occasional morsels of additional information, but felt like they were being parceled out. Way too often I thought, "I get it! Move on!"
Although the book is good as far as it goes, I was left wanting more meat.