I read both this and "The Making of a Manager", and I've got to say, "The Making of a Manager" has much better advice and is a lot easier to act on than what Manager's Path gives.

I think the primary difference is what point in their careers the book was written. Julie wrote the book early in her career while Camille has been in upper management for some time meaning that she's more distant from the challenges of becoming a first time manager.

And despite Julie's only experience being at Facebook, I still found the advice widely applicable.