I've been experimenting for a couple of months with going only high end specialty coffee beans (single source, higher elevation, good processing, etc) and can say I do seem to have sharper mental focus without the usual side effects of too much coffee in a day. I suppose it could be placebo, don't know unless I started doing double blind tests on myself.

The butter + MCT oil has been amazing. I used it once to fuel a 4 hour night snowboarding session in 17 degree weather (well plus a couple of egg yolks) and I felt great. Also seems to give me good solid even energy throughout most the day in general, prior to jiu jitsu classes, etc. Recommended.