I found this book outstanding. It's full of humor, turning what could be a dry subject, into a highly entertaining read. Many examples are packed into each section, making everything clear. Quite a lot of what passes for grammar is actually style, and Ms. Casagrande points this out on numerous occasions. There is a surprising amount of disagreement on how to use punctuation and grammatical phrases, and she points out which camps follow which "rules". I will definitely be trying her other books.
On a side note, and this has nothing to do with the book, I'm a bit angry after finishing. The only section in the book that rang familiar at all was the chapter on prepositional phrases. What were my teachers doing all of those years? I know most of what was covered in the book, but more on an instinctive level, than on an intellectual level. Aside from reading a great number of dry books (seemingly intended to teach children to hate reading), reading some Shakespeare, and taking numerous spelling tests, I cannot recall much of anything else being taught in my childhood English classes. It's no wonder that so many of the letters and papers I've read by young people are a terrifying mess of sentence fragments, nearly devoid of punctuation.