When comparing Logitech G9x vs Logitech M570, the Slant community recommends Logitech M570 for most people. In the question“What is the best mouse for programmers?” Logitech M570 is ranked 11th while Logitech G9x is ranked 16th. The most important reason people chose Logitech M570 is:
Using a stationary mouse will keep wrist and arm movement down. The trackball being operated by the thumb makes for great comfort (do not recommend finger based track balls). A trackball doesn't require a large flat surface, though next to the keyboard still tends to be most comfortable.
Specs
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Pros
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 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.
Pro Onboard memory for saving profiles
Logitech G9x allows saving up to 5 profiles on it's onboard memory.
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 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 Accurate and responsive tracking
Pro Trackball
Using a stationary mouse will keep wrist and arm movement down. The trackball being operated by the thumb makes for great comfort (do not recommend finger based track balls).
A trackball doesn't require a large flat surface, though next to the keyboard still tends to be most comfortable.
Pro Wireless
With 18 months of wireless power, it can be used in a variety of manners not handicapped by a wire.
Cons
Con Always wired
Not a pleasure to use compared to wireless.
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.
Con Low build quality
The shell is very cheap, thin plastic and the button sensors are either far too easy to trigger (left/right click) or ridiculously hard (back/forward, middle button/wheel).
Con Really awkward with the left hand.
Doesn't really go both ways