Well worth the money.
Yes you have to purchase two other books. Savage Worlds Explorers edition and Savage Suzerain, but you probably already have them or you wouldn't be looking at this book.
Good: If you like, evil vampires, Hong Kong movies, getting to play epic god like characters, cyberpunk and a setting other than European style or American style places this is the campaign setting for you.
Savage Mojo really does an outstanding job of providing enough material to complete the campaign. There are the main plot point sessions and a bunch of incidental sessions. Your PCs will make the next rank!
You have to save Shanghai by fighting 8 million vampires (not exaggerating) and you have twelve hours. You have swords, guns, magic and guts. Good luck, amigo.
Bad: I want more...just joking. I do want more, but that is not a bad thing.
Definitely worth the money.