Not quite sure what the Campari is trying to achieve here. Take it out and use some margarita bitters and you have a grapefruit margarita that’s simply better in my opinion.
I like the balance here. It doesn’t taste “spicy” per se. Just a long lingering heat in the mouth. A bit moreish because the finish makes you want to have another sip of the cold manhattan, only for the process to repeat. Finished mine way too fast as a result. Overall a fine way to mix up your manhattans for variety without compromising on its essence in any way. Makes it a bit more “manly” as well for those guests that let that prevent them from enjoying a classic manhattan.