Coke Zero was the first diet cola that tasted more or less like the stuff I'd been drinking. It helped me wean myself off sugared drinks. Today I drink whatever diet cola is available, but I still prefer Pepsi Max and Coke Zero, since they taste closer to sugared colas.
In my opinion, Coke Zero Sugar tastes much, much closer to sugared colas than either of those. It's sweeter and smoother than Coke Zero or Pepsi Max, and the only downside is a minor, different aftertaste than what I'm used to with diet drinks.
I'm impressed, and plan to buy a case once it becomes available (I've only seen single bottles in coolers so far).
Agreed, finally bought some at the store and I am very impressed with the taste.