I tried this last night with my boys:
Brand: Frostie Strawberry Watermelon Soda.
Origin: Detroit, MI.
Purchase Place: Blue Sun Soda, Spring Lake Park, MN.
Sweetener: Pure Cane Sugar.
Review: This was really sweet, and tasted like a "kids soda." It tasted like a liquid Jolly Rancher to me. My wife agreed, and also added that it's a bit like a "Freezie." It's decently flavored, but the flavor is soft and it goes down easy. It's not a fancy "adult" soda - just a nicely flavored soda for anyone to enjoy.
Score: 7.5 out of 10.