I only have two CS whiskies at present, Laphroaig CS and Ardbeg Uigeadail.
I've never added water to the Laphroaig. It's perfect just the way it is.
The Ardbeg however, I've started adding water to it. For some reason I didn't like the taste of the Uigeadail at first. And just when I started cursing myself for wasting $80, I read somewhere about adding a few drops of water to release the taste.
It works! Now I find myself reaching for the Ardbeg more than the Laphroaig. I'm even contemplating replacing the rapidly diminishing bottle of Uigeadail on my next whisky store binge.