Aspartame tastes like fucking shit, man. Every time I've tried switching to a diet soda (Mountain Dew, Mello Yellow, Sun Drop, etc.) the only thing I taste is that goddamn ass juice sweetener.
Instead, I modified my diet to simply reduce the number or regular Mountain Dews I ingest. I get fewer, but they taste better.
By the way, I live in Minnesota, and one of my friends bought a shirt at the State Fair that read: "In Sota, we say pop." The lawlz.