A little late on finishing this one as I got distracted by quite a few things, but I did finish it. All-in-all this book is an excellent read for anyone wanting a more in-depth understanding of .NET/CLR under the hood. There are several rants that Jeffrey goes into that I wish would have been left out or at least put in comment boxes. He mixes his opinion of coding standards and styles in with the factual information he provides, and I just would rather not see that. I am reading the book for the facts not for his coding style opinions. Regardless, he still provides a great deal of excellent information on the likes of Garbage Collection, Reflection, AppDomains, Threading, etc... It is not a tell-all book about each subject, but it does go into the kind of information that you just will not find in many other places. There was quite a lengthy bit in the middle of the book that seemed like filler material to me where he goes into "Essential Types". There were tid-bits of good information in there, but not enough to warrant the 150 pages he dedicated to it. However, in summary, any serious .NET developer should read this book or have it as a reference. I just hope some of it will sink into my thick skull. I plan on keeping it handy as a reference as well, as there was so much in there that I am certain I will not be able to retain it all.