First time I ever had this drink was at Potbelly Subs (along with their Italian sub, on wheat, with hots). It's like someone coated a lemon with some natural sugar, filled it with fizz, pulled the pin, and then threw it in your mouth. Yeah, it's that good.
I've been a fan of lemons for some time now, and even more so recently after I learned that they help prevent kidney stones (which I've had and aren't much fun). If you are looking for a refreshing alternative to soda, and the highest percentage of real lemon juice of any drink I've come across (most lemonade is only 14%, this is 18%). Not overly sweet either. Very crisp, almost a sharp tartness, and incredibly refreshing when cold and paired with just about any salty or summer type food (burgers, chicken, bratwurst, etc.). Highly recommend it, just look for it in Kroger or your local natural food store. Usually runs about $7 for a 6-pack, as opposed to the price here which is quite high ($14.50 on Prime).