This drink has a reputation of being a vehicle for easily consuming bad-tasting well-spirits, but it really is an impressive feat of mixology: 4 spirits; 8 ingredients are of equal parts; it all works somehow. This was the first homemade one that I've tried and it, not very surprisingly, was the best one I've ever had. I'd imagine that's mostly a result of using decent ingredients: Plantation 3 Stars, Hayman's London Dry, Ketel One, El Espolon Blanco, & Cointreau.
If you are tempted to cut the corner a bit and put in only lemon or lime juice, please don't. The combination of these two, IMHO, gives a delightful depth to the flavour.