I initially bought this book for my parents. They're big DIY foodies and had canned but not fermented for 30+ years. I bought the crock on Amazon and this book was recommend as a "frequently bought with" item. They loved both the crock and the book.
Meanwhile, I read the New Yorker Magazine article about Sandor Katz. What a fascinating guy! Google that article. Seriously.
Eventually, I got jealous and bought my own crock. I tried a couple experiments without the recipes in the book but soon caved and bought my own copy. It's great. Good stories, good directions, great attitude. I actually read it in bed it was so compelling. He's gives realistic volumes for ingredients and encourages experimentation which I really appreciate.