Fine, not amazing. Harry Craddock's version (heavy, equal amounts of gin and sweet vermouth; stirred with just a little Fernet Branca and garnished with a length of orange peel) is not bad. Spicy and boozy. Not a favorite, because I am not a vermouth fan, but if you like the deep herb flavors of Fernet Branca you can always go juust a bit heavy on that and back off on the sweet vermouth.