The interchangeable grips give the users two options. The Load grip has a broad rubbery surface with ample rest space for the thumb (and even the pinky toe) suited for strategy games and work. The Precision grip is narrower and has a plastic surface allowing firmer fingertip control. It’s ideal for a more intense game session. You can change grips by pushing down an ejection button on the back of the mouse.

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Figure 4: Both grips and the ejection button.

There’s no obvious place to insert the weight cartridge at first glance. That’s because it stays hidden under the interchangeable grip in the back of the mouse. There’s no way to quickly adjust the mouse’s weight (from 4 to 28 grams) as you have to first eject the grip and then the weight cartridge itself. The operation feels like loading a clip magazine into a handgun. As with the G5 model, the USB cord is cloth-wrapped.

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Figure 5: The adjustable weight cartridge.

In contrast to the G5 model, the G9 mouse doesn’t feature the usual installation CD containing the SetPoint application (a universal program for all Logitech products). You have to either download it from Logitech’s website or update it if you have a previous version installed (which was our case thanks to the already tested G5). The user can assign different functions to the mouse buttons using the software (like we did to the navigation buttons assigning them to “copy+paste” while running Word and to gaming functions like jumping and crouching).