There's an eternal debate about whether ebooks or actual books are better. Personally, I'm a fan of both. They each have their place. I like having a real book in my hand, but you can't argue against having an entirely library in your pocket as well as the ease of navigating through it. With that said, if you're wanting to get a PDF version of The Compendium of Equestria, you're in luck, as it's now available from River Horse.
In the book:
Players will find new playable races, expanding the options presented in the Core Rulebook, The Bestiary of Equestria, and the Movie Sourcebook. Together, you will find great new spells and talents to use in your adventures as well as the tools to create your own.
GMs can use both the Locations and Toolkit to help fill their Tails of Equestria games with deep and interesting settings and plenty of new features including talents and magical treasure.
Finally, you'll find a fully self-contained adventure: FLim, Flam, Alakazam! This can be used as a standalone story, or as part of a longer campaign, and it's a great opportunit to make use of the new content presented in the rest of the Compendium!