I no longer use any Razer products. Sold my naga mouse, and the blackwidow ultimate is sitting on a shelf. Too many driver issues, for me at least.

The G600 is slightly larger than the naga. I'd like it to weigh more, or have adjustable weight like the G500s. The side buttons are contoured, so it's easier to feel which button you're pressing. It has a "shift" button on the other side, so you can double up on buttons. It's definitely an improvement over the naga, but not by that much.

The software is nothing special, but it works and has no issues.