Maybe my lemons are too sour, but this cocktail isn't too sweet at all. It's delicious, but everything is about lmeon and absinthe. I didn't have mint. Whiskey here just adds strength, IMHO.
Had a Millionaire Martini yesterday, so would have to follow up this this cocktail. It is wonderful.
Also found it a bit sweet and would omit the sugar syrup the next time. Did find the mint and absinthe helped cut some of the sugar. We tend to like our cocktail a bit on the dry side, so it may be perfect if you prefer a cocktail which is sweeter.