No mention of mouse polling / refresh rate
One of the big things I look for in a gaming mouse is the polling rate - the default USB polling rate of 125hz leads to an input lag of 8ms, not to mention that at higher dpi it feels like your mouse is 'skipping'. I remember the first time I used a 500hz driver on a Razer mouse - it was quite a revelation in FPS games, and even in desktop use that required precision, such as Photoshop, etc.
The logitech has support for higher refresh rates - was any testing done on refresh rates or is this not configurable from the Logitech software? (You can find mouserate via google and use it to test your mouse polling rate.)