The G9x is a very customizable mouse with seven buttons, laser sensor with max DPI of 5700 and the ability to save setting profiles.
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Pro Comfortable for claw or fingertip grip
The thumb cradles for both grips are comfortable and additional buttons are in an easy access position that do not get in the way.
Pro Highly customizable
It can be outfitted with two different grips (a precision one and a wide grip one), has an adjustable weight, where the user can add up to 28g of weight to the mouse, and features on-the-fly adjustable DPI that can switch automatically depending on the program in use. There are also two scrolling settings - notched and smooth. Even the LEDs on the mouse are color customizable, so you can set a different color for different profiles.
Pro Can switch CPI settings based on program used as well aws switch on the fly
The mouse features on-the-fly adjustable CPI that can switch on the fly as well as automatically depending on the program in use.
Pro Onboard memory for saving profiles
Logitech G9x allows saving up to 5 profiles on it's onboard memory.
Pro Accurate and responsive tracking
Pro Customizable, profile-based LED colors
Even the LEDs on the mouse are color customizable, so you can set a different color for different profiles.
Pro Dual-mode scroll wheel
There are also two scrolling settings - notched and smooth.
Con DPI manual switching button placement is poor
The placement of the manual DPI "on the fly" button could cause users to accidently swithc when actually trying to use the left mouse button.
Con No longer in production
Discontinued and there is no direct replacement.