This is a good introduction to CouchDB. I would like more information about server internals from a book titled “definitive guide.” But it orients the reader well and shows CouchDB’s strengths and use cases clearly. The writing is straightforward and well organized. I think it does a great job at helping the reader see the possibilities and the elegance inherent to the data model and conventions built into CouchDB. I ended up feeling very enthusiastic about CouchDB.
My complaints about the book are that it sometimes doesn’t go into enough depth, and it is a little wide-eyed in places. One example is the section explaining how CouchDB can scale to exabyte datasets. I would also like to see a little more formal or rigorous treatment of some topics; I saw the phrase “crash-only design” in several places, but the book never explained what that means.
I haven’t read any of the other books on CouchDB yet, but this book was fun enough to read and made me interested enough that I would like to. On a related note, I contributed an introductory white paper about CouchDB.