I have the SteelSeries WoW Cataclysm MMO Gaming Mouse and it's just too big. My hand fits around it ok, but it feels like a lot of effort to shift the thing, so steering, looking, etc seem like hard work! Plus the software seems to grab the buttons and send the click to all WoW instances which can be really annoying.

So, I'm thinking of buying a Logitech G600. Does anyone know what is it like for size?