And, yes, I do [at least partly] mean that sarcastically (ie: smart @$$).
I'll start off by saying that Vitamin Water is awesome! I love the taste, it's very good for you, and there are enough flavors to keep anyone interested. This stuff is quite possibly the only thing that could ever replace regular water for daily intake.
Basically, it's like getting the vitamins and minerals you need while drinking the water you're supposed to be taking in already. Each serving (8 fl oz) is typically 50 calories and usually contains a low amount of sugar. In fact, an entire bottle of Vitamin Water (20 fl oz) contains about 40% less sugar than a can of soda AND provides your body with a number of much-needed nutrients.
There are at least a dozen different varieties with different purposes: focus, endurance, energy, essential, power-c, multi-vitamin, etc. I've tried a half-dozen or so flavors, and I've liked them ALL!! You will not find high fructose corn syrup, [added] sugar, aspartame, or saccarin in the ingredients list--only, as the power-c bottle states, "water + vitamins = all you need." They even use things like b-carotine to add color instead of rumored-to-cause-cancer yellow 5.
So, what makes Vitamin Water so smart? Each bottle has a little saying on it (kinda like the Starbuck's cups). Different flavors have different sayings, and each one is witty and humorous. Every bottle also says three things: for best results, stick it in the fridge; the inside is natural, the outside is plastic; and made for the center of responsible hydration (aka glacéau).
I highly recommend this product as a replacement for your current daily beverage of choice. The one drawback: it's a bit pricey. Target sells it for $1.39/ea, the lowest regular price I've found. Safeway carries it at $1.49 per bottle. QFC is running a sale right now: 4/$5 ($1.25/ea). They also make smaller bottles--great for kids or lunches, but not as cost-effective as the larger ones.