I use SIS tabs. I don't drink enough when riding, and find their taste more palatable than pure water. But I'm also mindful that they don't actually provide any energy and are expensive compared to water! But, I prefer to take my hydration and energy separately, hence use bars, gels sometimes, and proper food most of the time.
Torq wrote an article recently about using tabs vs using a genuine energy drink which is worth a read - on their website. That said, I still use tabs in my camelbak, food for energy and occasionally a bottle of energy drink when circumstances dictate.