As a native English speaker, there are a lot of things about English you don't really think about--namely, everything. Since beginning my journey in learning other languages, I've incidentally also learned things about English. Things I never knew or thought about, and found wildly interesting to learn about from the perspective of non-native speakers.
Thus, my interest piqued for learning more about my own native language, and subsequently, I purchased this book. And wow, was it so entirely worth it! I can't recommend this book enough to both native and non-native speakers. (But like, especially native speakers! English, in my opinion, is the most difficult language to learn, and this book really explains in detail why!)
You'd think an English grammar book would be boring, but I found this book to be completely the opposite. Although I read through it slowly, I was entirely engaged every time I picked it up. Nearly every page I exclaimed out loud things along the lines of, "What?!", "That's why?!", "OMG!", "This explains everything!" Any time anyone was around me, I had to mention something from this book to them. (Or text spam people, if no one was there.)
As a native English speaker, I've never had to think about any of this stuff. But since learning other languages, and being asked questions by non-native speakers, and my best answers always being, "I don't know, that's just the way it is," this book blew my mind several times with /actual/ answers as to why things are the way that they are!
This book could very easily be read cover to cover straight through, or used as a reference. The author seemed very grounded and knowledgeable about this topic, clearly they have a passion. I appreciated times where they pointed out what is grammatically correct versus colloquially correct, different rules for styles, differences between British and American English, and how language grows and evolves. If you're worried about this feeling like school all over again, I promise it's not like that. I definitely felt this book was more engaging and smarter about capturing my attention than what I recall of my school days. (But maybe I've just grown more curious about this stuff, I could be biased, who knows, haha.)
If anything, this book just lead me wanting more! It does a great job at covering the basics of English grammar though. And it's a fairly fast read if you sit down and just go through it, but I found myself wanting to write things down, or reread parts. It definitely got me itching to learn more about linguistics.
I will absolutely be coming back to this book. It's an invaluable resource. Even if you don't plan to write or speak, it's otherwise wildly interesting and I'd still say to go pick up a copy!