I just read this yesterday. I enjoyed it very much.
Quite interesting the dual role Jango plays in his life unlike the future Boba. Jango's ruthless but yet a very caring and loving father. Something we see very little in Boba later on.(In terms of compassion and feelings.)
Something else to ponder. Lucas is sort of peeling back a layer of SW by answering some questions about the beginnings of certain characters and events but there's a catch. He's basically we working that layer and creating a whole new series of characters and events with shady or unknown/unclear beginnings. Where's Jango from? Where was he born? What about Zam, Dooku, etc.? We'll be reading about SW for the next 50 years. The saga will never end.