Best book on SQL Server I've ever read. By far.
To be honest I had considered myself pretty advanced on the topic, but I've learned so much from this book, that it has made me revise this opinion. Author dives into really low-level details that shed completely new light on how SQL Server works under the hood. What is also important - regardless of topic's complexity and overwhelming number of details, the book is still readable and comprehensible.
What did I miss? I was a bit disappointed that low level description of latches was ommitted & there were some chapters that were almost screaming for some cookbook-style, more elaborate examples.
But otherwise than these, book is almost perfect. Highly recommended read.