It’s a great way to enjoy a book. I do that when I really want to devour a book, get fully immersed and tear through it as fast as possible. Usually, I’m reading on Kindle and listening on Audible, so it syncs my place between the different apps. I don’t usually listen while I’m actually reading, though there’s nothing wrong with doing that either. Reading along while you listen is a good approach if you’re finding something kind of difficult. The audio helps you keep momentum and the visual helps you stay focused.