A very fun, informative book with a comfortable rhythm:
Rubenstein (himself a professor and major contributor to the field of game theory) advances the cause of economics as a fun series of thought experiments and rails against the cause of economic as a useful series of applicatory models.
He peppers the book with memories & anecdotes (the back sleeve describes it as "half-memoir", which is apt) and his buttery writing style makes for a quick read that redirects your attention from bildungsroman to theory to praxis and back again with enough ease and rapidity that you never grow roots.
I do not think it is a life-changing book, as far as these things go: it strengthened my understanding of equilibria, and his presentation of two disjoint-but-not-really market lenses ("the jungle" and "the market") is something I'll hold onto for a while. But it was gripping and quick and made me smarter.