Absolutely without a doubt one of the best gin drinks a guy can make.
1.1/2oz Haymans Old Tom
1oz lemon juice
1/2oz simple syrup
3oz soda water
So perfectly refreshing

1.1/2 oz gin
1/2 oz Limoncello
Highball glass filled with ice
Top with 2-3 oz Sanpellegrino Limonata

Don't have a name for it but that's what I came up to with last summer when I was gifted a bottle of Luxardo Limoncello.

I agree, a reposado with Fever Tree sparkling grapefruit makes a perfect drink.

First one was by the book, second one was a, 2, 1, 1/2, 1//2 oz ratio and it worked better for me. Definitely will make again.