Also I own the Book of Cain and loved it. I own all the novels as well and the first two of the 5 recent comics.
Read the whole thing in almost one entire sitting. Parts of it were pretty good, such as the Anu / Tathamet story and the art (esp. with Tyrael!). However, I was left with a sense of disappointment after I was done reading Book of Cain. It took awhile for me to pin it down, but I can now say that source of it is the fact that it is lacking nearly any depth. I thought I would get more out of the experience despite the book being based on the fact that Diablo III is not out yet, however... I didn't.
If you're a collector of anything Diablo-related, you should be rather happy with this book. For those more casually-minded, you may want to save your money for any novel stuff that comes out after the Diablo III release.
Threats of violence. We take these seriously and will alert the proper authorities.
Posts containing personal information about other players. This includes physical addresses, e-mail addresses, phone numbers, and inappropriate photos and/or videos.
Harassing or discriminatory language. This will not be tolerated.