Well. It did a really great job of illustrating common pitfalls and making logical simple arguments against them, with cartoons! It got me to stop throwing a whole tube of toothepaste in my bag, to stop carrying a spare emergency bivy (jury is still out on what the heck situation I had in mind for that), stop carrying a 5lb 2 person tent for solo treks, stop bringing a 6 ounce headlamp that I loved how bright it got but generally preferred to keep my night vision, switch from a 60 ounce pack to an 18 ounce pack, e.t.c.
It freed my inner spreadsheet nerd! My girlfriend is still a little sore about that...