The G9 model breaks the mold of Logitech’s usual design for its top of the line mice. Just compare the G5 model’s pear-shaped design to the G9’s small body which supports two different interchangeable grips: a compact shaped one called Precison (suited for intense gaming) and a broader grip called Load, indicated for slower paced games and hours of desktop work. Whatever the grip you choose, the main body has two thumb buttons (assignable to gaming functions besides the pre-programmed Web browsing capacity); a led indicating the current dpi level (from 200 to 3,200), with two buttons to increase or decrease this value; and the free-spinning wheel for smooth and quick scrolling.

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Figure 2: The G5 and G9 models side by side.

On the underside there’s a button to adjust the spin modes of the scroll wheel between free-spinning or the usual rhythm found in common mice. On the original VX Revolution mouse – in which this new type of scroll wheel debuted – it was possible to select the spin velocity by pushing down the scroll wheel itself. Here you have to lift the mouse up to have access to this feature. The reason for this change is simple: during gameplay pushing down the scroll wheel is reserved for reloading weapons and other functions which would make it incompatible to adjusting the spin mode.

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Figure 3: The underside of the mouse.