It’s good—better than the much-revered Elements of Style, imho, which is overly prescriptive and frankly unhelpful at turns, even if it’s well written.

But my all-time favorite is Virginia Tufte’s Artful Sentences: Syntax as Style. It illustrates the variety of English sentence structures in an ordered way with a plethora of examples. The approach is not prescriptive; rather, it allows you inductively to develop a feel for the syntactical rhythms of the language.

Also, I love Stanley Fish’s How to Write a Sentence: And How to Read One. It’s a lovely, entertaining little book, filled with Fish’s insights as an eminent literary critic. What I appreciate most about the book is that Fish walks you through a number of examples and explains how and why they work, so you can walk away as both a better writer and a better reader.