When comparing Logitech G500 vs Logitech G602, the Slant community recommends Logitech G500 for most people. In the question“What is the best gaming mouse?” Logitech G500 is ranked 8th while Logitech G602 is ranked 15th. The most important reason people chose Logitech G500 is:
This gaming mouse also comes with weights (6 weights of 1.7g, 6 weights of 4.5g) that can be added on with a maximum of 27g of weights at a time.
Specs
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Pros
Pro Adjustable weight
This gaming mouse also comes with weights (6 weights of 1.7g, 6 weights of 4.5g) that can be added on with a maximum of 27g of weights at a time.
Pro Thumb-rest
The Logitech G500 has more an edge on the left side for users to rest their thumbs.
Pro Braided cord
The Logitech G500 gaming mouse comes with a braided cable.
Pro Great for palm grip
Clearly designed specifically for palm grip.
Pro Onboard memory allows saving settings on the gaming mouse itself
The onboard memory will allow the user to store on custom profile no matter what PC they plug the device into.
Pro Dual-mode scroll wheel
This mouse has two scrolling modes - notched and freescrolling. The modes can be switched on-the-fly with a button located just below the scroll-wheel.
Pro The thumb buttons that are close enough together to be used in FPSs
Pro 10 programmable buttons
There are ten programmable buttons on the device.
Pro Horizontal click scroll wheel
The mouse wheel can be clicked down in the center or to the left and right. This created three different buttons in one.
Pro On-the-fly CPI switch on the side of the left click
There is a switch on the side that allows for on the fly CPI switching.

Pro Great value

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.
Cons
Con Not produced anymore
Logitech G500 was replaced by G500s in 2013 and that in turn was replaced by the G502 Proteus Core in 2014.
Con Old

Con Too heavy even without weights
Con Scroll wheel is too loose
Clicking the scroll wheel is not precise and often the user will left or right click the wheel instead of actually clicking the center click.
Con Suffers from acceleration
All Avago ADNS-S9500 laser sensors suffer from acceleration issues and being that is the sensor used in the Logitech G500 it is a problem that this mouse suffers.
Con No driver for Mac


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.
