I'm finding that the G9 keeps 'losing' it's DPI setting - maybe justa driver fix needed (The LED display keps dropping back to just one bar lit up and I have to keep re-plugging it in to get the custom settings back)...
The things that look tempting on the Sidewinder are the thumb buttons - they look as tho they will be much better in an fast online game - very little chance of pressing the wrong one or both at the same time.