Slings sound delicious! The only type of alcohol that I like to drink is the fruity kind, so this sounds like something I would love.
I particularly love citrus drinks. I bet that pineapple juice and cherry brandy goes very well together, because I love eating actual pineapple slices with maraschino cherries. I also love pineapple upside-down cake, which has pineapples and cherries on top, so I may need to find a recipe for this sling to go with my dessert.
I really don't like the taste of bitter alcohol, and the fruit juice in my favorite drinks disguise that. Are slings more sweet than they are bitter?