I have the ereader version on my ipad. There wasn't any new-to-me info when I read it because I had already done lots of CG research, but I don't think it's a total waste. The videos are decent although I wished they showed all the hair types. The tips are ok too although they aren't particularly groundbreaking.
I did find the parts about about trimming and color useful and I also appreciate the style section.
I still open the book on occasion just to look at the pictures