Anyone use whiskey stones?

Have not... but they seem like a cool idea. CJ at Calandro's hooked me up with some a while back, but they still sit in the freezer instead of my drinks. Oops!

The only problem I could see is that some whiskeys actually open up more when the ice in them melts. So with whiskey stones you might have to add water to your whiskey if it is too hot (too high proof).

If you want it cool just keep your glass in the freezer beforehand.