When comparing Logitech G602 vs Logitech Performance Mouse MX, 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 G602 is ranked 19th. 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 Comfortable for palm grip with easy to hit buttons
Great for palm grip along with a the fantastic logitech software for key mapping and profiles.

Pro Great battery life
Good for users that want a wireless mouse without any loss of functionality or need to change the batteries every week

Pro Good optical sensor
Only up to 2500 DPI but it's a great sensor for those that don't need very high DPI.
Pro Can run on single battery for lighter weight
Users can opt to run the device on a single battery to cut down on the weight but this will have an impact on battery life.
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.
Cons


Con Somewhat heavy
Being that this is a wireless mouse there is the battery weight to contend with. Batteries in the weight of the device is 152 grams, which isn't all that bad considering but still not for users that like a lighter mouse.
The mouse can also be used with a single battery, which is useful for not only reducing weight but also for balancing the mouse. With two batteries the mouse can be a bit slipper on the right side when picking it up as the pinkie and ring fingers don't have as much to grip - but balancing the weight over towards the thumb allows the mice to be more easily picked up as the side buttons allow for a decent place to grip.
Con No wired option
The Logitech G602 does not offer a wired USB option, only wireless.

Con Macro Key Defect
Side buttons are known to register multiple keystrokes occasionally when pressed only once. With bindings such as Ctrl+F4, this naturally has destructive results.

Con Middle mouse button wore out after a year of heavy use
And with no way to open it it's near impossible to fix.
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.
