It's a subtle change, yes, but once you drink fruit-infused water for a few weeks, you will notice what "regular" water tastes like in comparison.
Week 1, I tried kiwi and strawberry.
Week 2: oranges
Week 3: watermelon
I've also heard good things about cucumber. The thought of that doesn't turn me on, but I'll give it a shot shortly.
Benefits? It's calorie free. And the fruit lasts all week. My recommendation is to change the fruit every 5-to-7 days, though. I left the watermelon in for 9 days, only to discover some mold on the inside top. Basically, you can tell when it's time to change the fruit by its discoloration. But I'd say every 5 days to be on the safe side...
Good little product for those interested in a "healthy alternative."