Been using for several months, took some time just to find the book as I never seen the likes at book stores. Book takes what you see from GP and puts it into a book so you dont have to stare at screends as much. I use the eBook as the organization of the book does not flow so well and is not that great as it seems to just ramble on. Only makes more sense to use the pdf version on a laptop anyway with all the searching for keys and values... Should have included the GP and and how it links to the Registry (ie changing this in GP changes this in Registry; it does exist on microsofts site and you wouldve thought it would in the book - I did not find). Book includes default settings so, for those of us who mess around there, thats a good bonus. A definite must have for those working in the Windows security realm