Anyone use this mouse? I have MX518 which works really well with USBOverdrive. I can configure all the buttons, and adjust sensitivity on this mouse. I am interested in upgrading to a G400, but don't know if it's compatible with the USBOverdrive the same way as the MX518. Anyone have this mouse with USBOverdrive who have all the buttons working properly? By buttons I mean side buttons for forward/back, and mousewheel middle click.