Dee Stump summed it up best - in comment below from 2022. Very nice scotch cocktail, smokey but still on the approachable side. I think the use of Nux with barrell aged bitters is excellent.
It's a lovely, serious cocktail. On a whim, because some monsters can be fun, we substituted 15ml Luxardo Aperitivo for the Rosso Vermouth and dialled the peated whisky down to 5ml. And we did it in a Nick and Nora glass in acknowledgement of Nessie's quiet elegance.
Perfect mixture of ingredients. Although my mother was from Scotland, I am not a big fan of the smoky. Decided to try this as it was one of the cocktails of the day. What a delightful surprise to see the ingredients work together. There is still a hint of smoky, but it is not overpowering. Loved it.