Firstly, two thumbs up for the "to the point" content of the book.
Even though it took a while for me to read this book, or rather I should say 'comprehend' it, the book felt not too long and not too short, I realized the content is just adequate/right to a more than a beginner in SQL Server, but I just wanted to experiment in my test environment in addition to what was in the book, as the end result today I have 11 queries optimized to save my customers total of 4 hours plus of wasted CPU time!
Secondly, there are so few books around on the "mysterious" Query Optimizer, to most consultants in my practice it was always intimidating to even think of trying to figure out what is going "behind the scenes", I guess this should not be anymore the case.
In short, do you want to learn on the most complicated and advanced topic from a 15 year veteran in SQL Server for a fraction of the cost of any class? You bet!