I bought this book a few years ago. It's still a great book. I highly recommend it to anyone.
As I'm a late learner in my forties, I would say this book has much augmented my vocabulary. Moreover, I've bought nearly ALL the vocabulary books from this website. I have SAT vocabulary books as well, all great too.
My review on this book: I rate it as one of the very BEST. I most read this book during tea breaks, during quiet period of business in shop, during babysitting. It has all the key answers to questions, articles with examples of usage, etc. Blank spaces around text allows me to pencil down my notes, mostly examples of usages. Every page has my pencilled notes. That's how much I love the book.