If you treat reading as a utilitarian exercise, you will love this book. With practice, you can probably attain a level of rapid reading that’s fast without losing comprehension.
But reading is sometimes fun if you take a moment to savour and reflect on the written word.
Certainly, most people can read faster if they change some of the common habits (eg subvocalisatiion).
So is this book a good read? No. Is it useful? Yes.