Headed over to JP Licks on Newbury today. They were giving out free scoops due to the home opener. I got two generous scoops of el diablo and they got it right. More of a cocoa flavor than a sweet chocolate and a hint of cinnamon and then just after you swallow the heat from cayenne kicked in (and you could see the red spots in the ice cream!)
I will definitely have to go back to try this in milkshake form when it gets warmer.