This book, unlike others I've bought on copy writing, is packed with examples that highlight how to write clearly and concisely. However I didn't find anything about it terribly revelatory - I never had the sense that my copy writing had made the next level. Which was a pity because I was very much a beginner. Copy writing is as hard as anything I've done, and I've written manuals, policies, novels, short stories, unhappy reports, an industry standard, and funeral speeches.
The book contains a useful section on English grammar at the end. Which is good, because as a product of the public education system in Alberta in the '80s, I didn't get that.