I purchased a Logitech G9 mouse for use when I use my Mac laptop for Team Fortress computer game after a LOT of research.  Team Fortress is a Windows application and the G9 really improved my game.  I am a terrible player and needed an edge.  The G9 gave really worked as a terrific gaming mouse.  I was using a Microsoft laptop mouse when running Mac applications becaue the G9 took so long to move across the computer screen when in Mac mode.  I decided, one day, to try to figure out how to make the G9 work for Mac.   I first tried to load Logitech Control Center 2.6.  It claimed to set control for Logitech keyboards and mouse but it did not work.  What did work was a wonderful shareware application called SteerMouse.  I know can use my simply awsome Logitech G9 for Mac and Windows.