I don't do vodka at all really. The Bacardi is a flavored rum, as Evan was getting at above^. I never thought I would buy a "Limòn" flavored rum until someone had me try the two together. I think I actually went and bought a bottle the next day. For $17 for the 1/5, I wouldn't be mad if it sat around a little while and slowly got drank, surprisingly though, it went pretty quick. A LOT can be added to the original Rehab without being noticed. Definitely a good summer/chill out and get a good buzz drink.
I've always seen that firefly, but was unsure to try it. Next time I'm out at the store I'll give it a try though