Yesterday I tried C2O organic coconut water (refrigerated bottling) for the first time. I like it better than my previous favorite Harmless and also more than In Vivo, the two other leading brands for fresh, refrigerated coconut water.
C2O has a bit of an acidic lift that makes it taste fresher and more natural, like you're sipping it straight from a fresh coconut. It also seems a little sweeter than the other two.
I purchased this at Whole Foods in Laguna Niguel.