I read it and found it very good.
It's a thick, pocket format, book full of articles, reviews, studies and interviews. The kind of book you don't read from front to back, but browse freely: from a review of "Who Saw Her Die?", to an interview of Sergio Martino or an article about Mario Bava.
A few analysis are a bit artificial (some critics try to see things that are simply not there) or inacurate (the genesis of the Giallo, especially), but overall this a excellent book. A collective work of passionate and educated people. One of the most complete and interesting study of the genre I read.
I highly recommend it, for those who can read French...