I’ve been thrilled with duviri for the same reason! I’ve gained some respect for weapons that I had previously disregarded and sold after leveling. It really feels like it’s putting new life into the game. At least to someone who’s gotten through most of it.

Stones are less effective overall because they don’t melt. A very substantial part of the temperature change you get from putting ice in something is actually from thermal energy in the liquid going towards breaking the bonds between molecules that comprise solid ice in order to make it water. Without that sink for heat, you’ll still cool your drink by allowing the colder solid to absorb heat from the liquid, but the temperature change will not be nearly as much.