Love the different citrus tastes with each sip. The bitterness of the orange comes through with the clean taste of the vodka. This is perfect time to use your mid to upper range vodka in your drinks cabinet. We used Ultra 34 by Purity out of Sweden.
I just tried it with bison grass vodka (my favourite vodka for some time now). It is very much a citrus-forward drink, definitely has a 'clean' taste. I still prefer the brandy/cognac based Sidecar but it's an interesting twist for sour-lovers.