I cracked into this last night:
Brand: Diet Sparkola Cola
Origin: Los Angeles, CA.
Purchase Place: Blue Sun Soda, Spring Lake Park, MN.
Review: This had a pretty rich/deep flavor for a diet! It was a decent cola that had a bit of a berry flavor and a hint of cinnamon. Not bad! And quite good considering it's diet. (I wouldn't have guessed it was diet!)
Score: 7 out of 10.