When comparing Logitech Performance Mouse MX vs Logitech G9x, the Slant community recommends Logitech Performance Mouse MX for most people. In the question“What is the best mouse for programmers?” Logitech Performance Mouse MX is ranked 1st while Logitech G9x is ranked 16th. The most important reason people chose Logitech Performance Mouse MX is:
Hitting a button behind the scroll wheel changes the scroll wheel from clicking up and down in a controlled manner to allowing you to flick it and quickly scroll through large portions of a document.
Specs
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Pros
Pro 'Flickable' Scroll Wheel
Hitting a button behind the scroll wheel changes the scroll wheel from clicking up and down in a controlled manner to allowing you to flick it and quickly scroll through large portions of a document.
Pro Ergonomic design
The MX is an full-sized, ergonomically designed mouse that is designed to fit the hands of those who prefer a palm grip.
Pro Works on any surface
The MX uses "darkfield" technology to allow it to work on glass, mirrored surfaces etc.
Pro Good battery life
Once fully charged the mouse lasts for several weeks of moderate use before requiring further charge. Users are notified through lights on the mouse itself, and systray notifications when the mouse is nearing the end of its charge (generally several days before). Even after several years of use this appears to be the case.
The mouse uses one AA battery. A rechargeable NI-MH battery is included. The battery compartment is easily accessible, requiring no tools to assist.
Pro Well designed extra buttons
Three programmable buttons are easily accessed by your thumb.
In addition to the Zoom, Forward and Back buttons depicted, the thumb rest has a button for switching between applications, the mouse wheel may be held to allow drag navigation, and the mouse button may be tilted left or right for horizontal scrolling.
Pro Logitech Unifying Receiver (Dongle)
The [Logitech Unifying Receiver][1] allows you to connect multiple (up to 6) devices through one single, small dongle. The dongle itself is made up mostly of the USB connector, meaning it's small and so stays out of the way, and is unlikely to be bent or broken if knocked.
Pro Works whilst charging
Though the mouse works wirelessly, it's recharged via USB. When recharging, the mouse continues to work .
NB: The mouse still communicates wirelessly, so requires one USB for the Logitech Dongle, and one for the charge cable.
Pro Useful accessories
A travel case, a USB charge cord and a USB-to-outlet-power adapter, and a USB extension cord for the receiver.
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
Cons
Con Durability issues
A common problem are the buttons failing after only a few months of use.
Con Price
The price is currently hovering around the $70 mark, being marginally over this price from a number of outlets, putting it at the maximum limit of this question's price range.
Con Middle click not safe
When pressing the middle button by pressing down the scroll wheel, the left or right scroll-wheel buttons can be triggered. That can lead to accidentally going back in the browser or whatever is configured for these buttons.
The middle click should be a safe thing, where nothing else could happen.
Con No left handed version
Con Heavier than a typical mouse
At 147 g, compared to a typical weight of about 100 g, the mouse may take some getting used to. More often than not, heavier mice can tire your wrists after extended use without rest.
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.