Spritzing the oils from the lemon twist moves this drink from good to great. Definitely boozy, slightly bitter, but you get a bit from all angles -- a touch of sweetness from the Carpano and bitters, a bit of citrus from the twist and bitters, and then herbacity and bitterness from the Campari, gin, Green Chartreuse and Carpano. Lingers in the mouth for quite some time. Might prefer over a large ice cube, especially if it's served in a warmer setting. Heavy, after-hours cocktail.