The Onyx Path C20 book is fairly complete, but ulitmaltely not as solid as the V20 materials. Where the V20 book was a distilled version of all of the Vampire: the Masquerade materials, C20 was simply an expanded version of the main book with some highlights from the supplimentary materials. To be fair I have not had the oppertunity to play with the mechanics, this is based on scanning through the content.
This book is a nice update and tranisition of Dirty Secrets of the Black Hand to the V20 setting. It is well written with a RetCon of the '99 3rd Ed Changes. There are a lot of clarifications and expansion of the material. If you are interested in the True Hand, Ghenna Cults, Baali, or Lilith Cults; this is the book for you.
The scan is perfect, I haven't found any issues with the OCR, but the material does not work well with everything written before it on infernalism as it is focused on Demon the Fallen, but ignores most of that material as well.