I got the PDF as soon as it was available and will be purchasing the print copy once the errata is included.
I would categorise this book as a useful supplement, but not a necessary one. I particularly liked the elements to do with Domain Building, including expanded backgrounds and the streamling of combat (which always felt overly dice heavy). The clan apocrypha, particularly the nosferatu apocrypha, was very interesting.
I wrote a full review on the following site
If you don't have time to read my conclusion is as already stated. Useful, but in no way necessary to a game. If you enjoy Dark Ages setting and you have the cash, it is a worthy addition
[4 of 5 Stars!]