Want to learn Scala properly? Don't look for other books. No seriously, don't!
Some books rush towards all the nice advanced language features or first dive into build/development tools, soon confusing the reader or outpacing most people who don't happen to have lots of experience in similar (functional) languages.
This book feels like being in a class room with an inspiring experienced teacher who starts out from the basics (well, skipping the programming-for-dummies introduction of course), and then gradually builds lesson upon lesson in a logical order, all the time keeping the students attention.
I find that whenever I have a question while reading this book, chances are that this very same question is raised soon after in the main text or it gets answered by one of the numerous clear code examples, foot notes or short intermezzos.
You can call this book a bit "academic". It's true...but in this case that definitely adds to its quality.
True, the programming examples may not be the kind of programming tasks that you usually handle. However, they are understandable and well picked to show the language features that the text is dealing with. The writers show teaching experience and know how to explain the motivation behind the language design. It helps to understand how things work when you know a bit about why they were designed that way.
To summarize: Pick up this well written book and keep a computer with Scala at hand so you can experiment as you go along. I think you will have an enjoyable learning experience.