The "WOW" factor of this text is inversely proportional to the read's prior experience with database performance tuning.
In my opinion, a DBA (or a developer) with 0 - 3 years of experience can expect the following after reading this book
1. Know what to do when a 3 page query is dropped in their lap for tuning (trust me, trying to convince the user the problem is with the network, or their
machine, or with them !!! does not work after a couple of times :)')
2. not be intimated to read and to analyze an AWR report
3. can incorporate performance related daily checks in their day-to-day activities
4. can actually answer the typical performance related interview questions (e.g. how to tune an instance, how to tune a query, etc)
5. have the background to read advanced performance tuning literature
Following are some suggestions for the subsequent editions of this book
Chapter 8 "Creating Efficient Sql" adds no value and can be scratched in favor of the following topics
1. Sql Plan Management (after all, one of the authors has talked extensively about it in their "Oracle Database 11g" book)
2. Local vs Global indexing (when to use them, how to create them, etc.)
3. Why, which (local vs global), and how often to collect object level statistics
4. Highlight the performance tuning similarities and differences between OLTP and OLAP systems
I am almost tempted to add "RAC Performance Tuning" to my wishlist, but it might be an advanced topic?
In summary, I would recommend this book to anybody wanting to get started on Oracle performance tuning