The comment in the article describing this as "just what it says on the tin" is bang on. Without wishing to sound rude, this is probably the most unremarkable cocktail I've ever had on this website. It was made a lot more interesting with an ounce of rye, but even still, I just can't recommend it. You can do so much more interesting.
Fantastic after-dinner/dessert cocktail! Indeed, it's sweet and sour coffee. But I have a feeling this may not work as well with a really dry coffee liqueur, though I could be wrong.