Very delicious, but quite boozy/hot. I liked it better on the rocks, giving a bit of dilution (as written, this cocktail yeilds a higher ABV result than a typical whiskey old-fashioned). You'll need to know your guests before springing this on them, as many may not appreciate the high proof. Again, it is delicious - the Nonino flavor notes display very nicely with the spice of the rye. I think other high proof amari would be interesting to experiement with.