I've read into Dave's stuff a bit, and it sounds like mostly bs to me, but I have heard good things about bulletproof coffee, though it's all been anecdotal.
Do you really feel better drinking it, or is it just a nice way to get quick, easy calories in the morning without any insulin spike from carbs?
I feel less of a caffeine crash from it, and a more even caffeine buzz. I'm not doing it for calories, as I already do 4HB or paleo breakfast WITH the bulletproof coffee.
This would have been more interesting had you added nutrients and protein to your version of bp coffee.