The official "bulletproof coffee" beans I received had no aroma and little taste. So although the idea is sound, I wouldn't recommend the beans themselves (perhaps I got an old batch, and I did feel fine after consuming). The guy selling/promoting is recommends traditionally wet-processed coffee beans in general. I found Peets "Ethiopian Fancy(Whole Bean)" mail order to be superior in taste and freshness. Their in-store beans are refreshed weekly.

I wonder why not high quality cream or whole milk instead of butter. That said, I am tolerating the taste/feel of unsalted butter (+MCT) in my espresso, and the energy+satiety is nice.