Has anyone tried flavored tonic in their G&T?
I really like this one with a squeeze of lime and a dash of Peychaud's bitters:

I really like their elderflower tonic. Works well when you have a less than premium gin in covering up some of the harshness. You don't even need much lime.
Oh, I forgot to tell you, I tried the elderflower tonic last night. I do love citrus, though, so I also added plenty of lime juice. There were about two ounces left of Bombay Sapphire in the bottle, so I started with that and then added probably one additional ounce of Tanqueray N°10—both pretty heavy on citrus, and plenty of juniper between the two, so just what I prefer. Then some lime juice and several dashes of orange bitters.
I must say, I expected the elderflower tonic to be a lot more floral than it was. Instead, it had quite an inoffensive flavor: sweet and mellow. So I was pleasantly surprised in that way. But, perhaps for similar reasons, it left me wishing there were
more flavor to hold my interest. I'm certainly not disappointed, but I'll probably stick with the cucumber one in the future.