I find myself in agreement with most of the other reviewers. I had pre-ordered the book and watched its development through numerous e-book releases.
The extent to which it covers the fundamental but not as often explained concepts so important to the Framework (Helpers, etc) is impressive, and it covers a lot of ground. I had many 'a-ha' moments.
However, I also had a fair amount of frustration with the code examples in the book (the code on the web site ZIP file does seem to be absent these errors) - many syntax errors, and such. I also found it a little frustrating when the code examples were broken down so finely, into a couple of lines at a time, and often crossing multiple files (but without mentioning this).
However, the book is excellent and a great resource, and I'd be keen to see how a 2nd Edition looked.