For starters, it definitely smells like two things: Grape Kool-Aid and Grāpples . And it tastes fairly decent, too! Sweet, but not gross-you-out sweet. This I credit to the lack of artificial sweeteners. Instead, the sweetness comes from rebiana which Wikipedia says is a derivative of Stevia (a plant-based sugar substitute you've probably seen at the grocery store). Another thing I must mention—this mix contains electrolytes that "aid hydration when you consume one packet during light physical activity."
I don't know much about electrolytes, though I see them called out on a lot of drink labels. WebMD states that sodium, potassium and magnesium are some common electrolytes, and that we lose electrolytes during workouts because they're in our sweat. I also learned that electrolytes are very closely associated with water intake because they help regulate fluid levels in our body. Obviously our body can regulate fluids naturally since we always have a supply of electrolytes within, but as we push it to work harder, it doesn't hurt to help it out in an effort to avoid dehydration.
Though you have to be careful about how you're helping it out. I'm always in favor of doing it naturally, and I'm not a dietitian so I can't really say whether this mix fully fits into that thinking. But I can say this: I'd rather drink water enhanced with Crystal Light PureFitness than a gigantic, over-sized bottle of Gatorade any day.
I typically shy away from Lemon-Lime drinks because they always seem to remind me of household cleaners. Not that I drink household cleaners, but for some reason Lemon-Lime drinks always taste a bit chemical to me. Such is not the case with Crystal Light PureFitness Lemon-Lime drink mix. I found it to be extremely refreshing and definitely worthy of my water bottle.