This is easily the best Logitech mouse yet. I own both the G5 and G9, and settled on the G5 as my primary mouse some time ago. Performance-wise, it's technically better than the G9 and noticeably superior to the G5. The Setpoint software that is used with the G500 is also different from that of the G5, allowing for more control over the mouse. Pros: -Better placement of the dpi increase/decrease buttons. It is now easier to change your dpi while gaming without awkwardly readjusting your hand position -Smooth finish makes cleaning easier and increases overall comfort -Hyperfast scrolling feature. Very useful when scrolling down through long documents or websites Cons: -When in click-to-click scrolling mode, the scrolling is a little too sensitive which can be troublesome if you are playing a first-person shooter that uses the scroll wheel to change weapons.