We switched to the Coke zero sugar products a couple of years ago. Took a bit tomget used to the taste change, but they're all MUCH better than the diet products from Coke or Pepsi.
I'm not a fan of the "flavored" products though. Just gimme the regular Coke or Sprite flavor. No cherry, strawberry, peach, grape, ear wax, or vomit for me.
Yup, I can say I'm quite happy with Coke Zero. First time I've had a diet drink that I could say I actually liked, and not one that I drink just to avoid the sugar but don't necessarily enjoy. I'd rather drink water more often than not, but it's handy for a change of pace and also for cola mixed drinks.
But I always liked Cherry Coke and Vanilla Coke and would love the Zero Sugar + Caffeine Free treatment for those flavors specifically. Zero Sugar is a nice step in the right direction for new flavors though.
And I would still like to see an evolution of the Zero Sugar approach. There are alternative sweeteners out there that may be tricky to work with, like stevia, but there are also the sugar alcohols like xylitol and erythritol -- xylitol has the added benefit of helping prevent/fight cavities, though also the slight issue of being very toxic to dogs for sure, not sure about other pets). I know they work with stevia, at least with one or two of the sweet compounds in the plant, but the only one I can find locally is still something like half-sugar with stevia added. And speaking of the stevia compounds, there is one that isn't commercialized as much but doesn't have the negative aftertaste some complain about. Splenda actually has a sweetener with it, only one I've seen with that specific compound, Rebaudioside D (Reb D) in a blend with erythritol, and it actually works pretty well. Erythritol has an issue of having a "cooling" effect so it doesn't work in all sweetener scenarios.
But there are so many blends Coca Cola could use that aren't Aspartame and Ace-K, really wish they'd get something out there that does away with them and still has zero sugar. Perhaps tougher than I imagine, there are certainly interesting sciencey, chemistry and flavor lab work considerations that they've spent millions of dollars incubating to get such a blend that also doesn't cost an insane amount. So many variables. But dammit, I want!