Agreed, I particularly like the way each chapter dealt with a rank further up. Even if you have _no intention_ of going higher, seeing what they want from you and what they should be doing was immensely helpful and clarifying.
Also highly recommend this. Unlike some other books, it's highly tailored towards being a leader at a tech startup, and has great, specific advice. It's also broken down by chapter, so you can read the bits that are relevant for your role.
Having read many of the books recommended here, I found this one to be the most concretely useful of the bunch. No fluff, just solid advice from someone that went from engineer to CTO.
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.
I think all non-managers should read it as well as it will give you some clarity on what you should expect from your manager and what their day-to-day is like.
http://shop.oreilly.com/product/0636920056843.do