For a couple years now I've been lugging every single physical book I had for the TTB/Malifaux universe to events. Now, I think I can make do with this.
The new core rulebook clarifies, simplifies, and better organizes the information players need to know. In addition, the expanded bestiary and (slightly dense, but still great) timeline of the history of Malifaux make for a lot more material for writing your own campaigns. All the better to have the PDF; with this much content, you'll want to be able to search it digitally for what you're looking for.
The one big drawback to this book is that the flavor so common to the original core and expansion books is somewhat lacking here. If you're looking to get a taste of what the world actually feels like, flip through the flavor stories and adventure hooks in the expansions, or listen to the Breachside Broadcast. It seems like Wyrd got down to brass tacks on this book, for better and for worse.
Tl;dr version; Good looking PDF (a digital version on a nice screen does justice to the gorgeous artwork), generally good update to the system. The cost felt high on purchase, but I ended up satisfied with the product I got.
[5 of 5 Stars!]