Hi slim, I just started reading that book. I will be honest and say Packt books are sometimes thought of as poorer quality because of poor editing. I just read the first few pages and the editing of grammar was poor - some of the sentences didn't read properly. This may or may not suggest the code editing is poor as well, I can't say yet. I happen to have a lot of tokens for free books from Packt so I took a chance. Maybe when I get time to read more I'll be able to come up with a good review, but I thought I'd let you know how it looks so far.