I don't drink a lot of soda, but I recently tried this one and loved it. It reminds of Faygo's chocolate soda that I used to be able to get but can't find anymore...
It's VERY sweet, with definite chocolate and cherry flavors. A nice change of pace. Oh, and it doesn't taste like diet soda, which is a big plus for me.
Dr Pepper - Diet Cherry Chocolate is recommended by Badtz7