I don't really get it.
Lower alcohol and bitterness than Campari but with the same sugar content.

Campari is so bitter as to be undrinkable.

This is an outstanding cocktail, filled with layers of flavor. I finally got a bottle Green Charteuse recently and it adds an important element to this drink. Just a lovely celebration of celery, sweet, sour and vegetal. Many thanks for this one - new favorite.