Naturally, the book is an early access so it looks like it use a second pass with an editor. That aside, I really like the way the authors spend some time discussing the features of the language, and why they are implemented the way they are in Clojure. They do a great job of explaining Rich's design decisions, how they affect the way you would normally approach a problem in Clojure, the pitfalls, along with comparing some of them (esp. the concurrency aspects) with other languages like Erlang.
I was a little skeptical before buying this book, but I am glad I did. fogus and the others have done a pretty good job so far. Definitely worth the money.
I'd think of them as companions to each other, and both likely worth getting (I've read 2 of the 4 available chapters and found them very good).
The promo discount code is pretty substantial, total cost of the print book was ~$33 shipped.
Discount/promo code; you can go to Manning.com, in upper left there's a "Email newsletter" link, they send out codes a few times a month.
This book (at least from what I have read of it) is attempting to help you appreciate and align yourself with "the clojure way".
One note: I noticed what looks like a Markdown artifact in Footnote 3, in which the URL for the Wikipedia entry on jumping the shark appears to have interpreted the underscores in "Jumping_the_shark" as signifiers that "the" should be emphasized (i.e. rendered in italics).