As mentioned in comments below, I obtained a 2-liter bottle of Coke Zero at Brookshire’s today. My first impression of the beverage is that it’s very good—you’re not likely to confuse it with Coca-Cola Classic, unless you just haven’t had a Coke in a long time, but it’s not in any way similar to Diet Coke and I really couldn’t discern any aftertaste. I also think it’s better than C2. I think Coke has a winner here.
It also makes a very good mixer with Bacardi Gold—too good perhaps.