With a large cube the 10 oz glass does it's job, I do like the variations with other spirits. I used a German Brandy myself, and I definitely want to revisit it with Novo Fogo Colibri, Chilean Pisco, and a Mezcal.
I read the comments before making a version of this and I used what I had on hand. My drink consisted of Asbach Uralt 3 Year Old(because I saw some were using grappa), Yellow Chartreuse(because I don't have Strega), and Cynar 70(because I like higher abv). My version is sweet on the front and mid, while the bitterness comes in slowly at the end and lingers on the palate. It reminds me of a Boulevardier, but with more herbal notes. I have a Chilean Pisco, on hand and I'll revisit it.