It was good! Bitter but not too much (drank it black). Chocolatey! A bit weak using the same amount of grounds as I normally use for coffee, which means this could get expensive; then again, my grinder is a blade grinder, so a lot of big ol' boulders in the mix. (Also a lot of fine silt, which settled to the bottom of the filter and started plugging it up almost immediately - a problem I've also encountered when adding a bit of hot cocoa mix to my grounds).
I guess I should consider the whole lead-and-cadmium thing before I pursue this further, huh.