Diet Coke fans (hi, Kristin!), you might have seen the new Diet Coke formulation that's sweetened with Splenda instead of Nutrasweet. I bought a 12-ounce bottle for 50 cents to try it, and I assure you that it really doesn't taste like Diet Coke at all. Or regular Coke. It tastes sort of lemon-limey—but if you wanted your Diet Coke to taste like lemon or lime, you'd buy Diet Coke with Lemon or Diet Coke with Lime. I took one sip and put the cap back on to make sure none of it could get spilled anywhere near my tastebuds.
I think that Pepsi One might have different sweeteners, too, but I haven't tried it. For me, Pepsi products are associated with times of great privation—those occasions when Diet Coke is unavailable. Some of you know what I'm talking about.