Bought myself the book of cain for christmas, and started reading it today, only on page 19 so far, don't wana finish it so quickly hehe. Great read so far, 10/10.
Edit: finished it earlier today, most defiantly the best book I've read in awhile, and I don't like reading. Brings you through the world of sanctuary from before d1 all the way to a little into d3, perfect for anyone about to buy d3 especially for the lore like me. I love Diablos lore so much heh.
The book was a really good read, but if you have played both D1 and D2, as well as read any previous books in the Diablo series, you already know 95% of the contents within it. It has a few clues regarding D3, and the artwork is stellar. Overall, I enjoyed it.