This is the end all be all of shadowrun sourcebooks.
LIKED: Combined with the main shadowrun 3rd edition book this creates a game superior to shadowrun 4th edition. Other sourcebooks may help amp up characters but this book adds onto and streamlines the game the metavariants more than double the amount of characters you can play and the point system here is much more balanced than the one used in 4th edition and much more flexible than the priority system of the basic games 1 through 3. Though this book isn't a campaign manual it's full of ideas for campaigns. Though it isn't a class manual it's full of character ideas for different archetypes. Though it's not a players manual it has a lot of information for players to think about. And though it's not a GMs manual it's got tons of ideas for villain creation and random encounter creation.