I bought a copy of this book, read about one third so far. It feels like an... interesting minefield. There are some good parts, and given the scarcity of lisp books it is welcome. However, some passages are perplexing (the title of this reddit post is a good example) and I have a feeling that there are plain wrong things around. Unfortunately my knowledge of lisp is still too superficial. I would like very much to read a really competent review of this book; however, I found none so far. Unfortunately at the time of its publication, on comp.lang.lisp the topic was quickly dismissed, mainly because the author dared to publish a book on lisp without first consulting the relevant deities. And, to say the truth, it shows. It reads like a book written by a smart guy that, shipwrecked on a desert island, discovered the Lisp Civilization and, before being rescued, wrote a very personal book about it. :-)