I haven't tried that, but I do regularly drink Pepsi Zero and I'm pretty happy with it. Enough that I switched from being a Coke Zero drinker.
More recently, I tried the Dr Pepper Zero and I like it very much as well. I have long been a fan of real Dr Pepper, but I just don't want that much sugar in my life. Diet Dr Pepper is gross, though I know people who like it. Dr Pepper Zero is close enough to the real thing that I don't feel like I'm missing out. I even inadvertently bought a pack of real Dr Pepper (the bottles are the same color!) a few months back and drank one without realizing I was drinking the full sugar version. That's quite a compliment to Snapple for their formula.