Yeah, Firefly is amazing. I don't know about the hangover thing. I've been catastrophically hungover from Firefly, though it does help tremendously in a hair-of-the-dog morning after type of way. 1/2 and 1/2 with water is my usual mix, but the lemonade thing is also amazing. Shots straight aren't bad, but a little on the sweet side. Like a shot of iced tea concentrate.
Thanks for doing the research. I'm also very curious!