That's a tough but great question. I spend a lot of money on books very loosely. It's one of the areas of my life where I don't really think about a budget. I just want to consume more and more if I can. And I leverage my local library, local bookstore and Amazon to the hilt.

I don't remember who said it but I take the advice of "if there's even a single thing in the book that you make note of, it was worth buying". And there's a lot more than a single thing. I actually skimmed through the book a second time and jotted down notes from each chapter I want to dig deeper in (e.g. another author mentioned, a research paper, one of the exercises).

So for sure I think it's worth buying.

I've been listening to the audiobook and have enjoyed it a great deal thus far (about 1/4 in). Helped me think about work in a new / fun way that has helped me start of the year right.