For the price $0.00 on Kindle when I "bought it", if your are interested in Microsoft SQL, you can't go past this book. Of course, the biggest cost with any book is actually the time spent reading it...and in this case, it definitely gave me a good intro to the things in SQL 2014 that I should be paying attention to. I should say that I am an infrequent "DBA" across multiple platforms, so am familiar with the technology, but consider myself as an amateur.
If you are involved in Big Data, it includes some useful introductory info about the Microsoft approach.
So often these kinds of books feel like they are written by marketers, or people who have only just played with a beta - but this book isn't that type. I'd pay good money for this. Recommended.