The book does a good job of making the game feel like a Fallout game, and despite the focus being on the Commonwealth, there is good reference to other settings and the rules are robust enough to allow you to homebrew to adapt to a different locale. The system also keeps true to lots of Fallout themes, if mildly crunch heavy. Only downside is a major lack of focus on GM rules and aids, requiring another supplement only available from the publisher as a physical supplement. Not very new GM friendly therefore and probably more of a Player's book than a Core book.