When comparing Mad Catz RAT 7 vs Gamdias Erebos GMS7500, the Slant community recommends Mad Catz RAT 7 for most people. In the question“What is the best gaming mouse?” Mad Catz RAT 7 is ranked 37th while Gamdias Erebos GMS7500 is ranked 84th. The most important reason people chose Mad Catz RAT 7 is:
It will still work just as well as the day you bought it.
Specs
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Pros
Pro Reliable; keeps on going through the years
It will still work just as well as the day you bought it.
Pro Incredible flexibility
Many parts of the mouse are adjustable with interchangeable pinkie grips and palm rests to a custom weight system. The mouse is able to literally change its size and weight.
Pro Cordless version available
It also comes in a cordless version, called the RAT 9.
Pro Customizable weight
There are four 5g weights included with the device that users can place inside to customize the exact weight they want the mouse to be.
Pro Lighting control
There is lighting control for this device though its included software.
Pro Built in memory
There is built in memory on this device that will allow users to store up to 6 different custom profiles. this way no software is needed when the device is used in a different PC.
Pro Interchangeable side panels
There are interchangeable side panels that change the ergonomics of the device to suit the user.
Pro Ambidextrous
The Gamdias Erebos GMS7500 is an ambidextrous mouse.
Cons
Con Laser (not optical) sensor
Laser sensors are just not that great when compared to optical sensors. Often there is acceleration issues with laser sensors.
Con Expensive for what the internal hardware is
Sadly the components inside of this mouse are pretty cheap, ranging from the switches to the laser sensor. For the price Mad Catz is charging one should expect higher quality components.
Con Forward / back buttons wear easily
The two buttons located on the side of the mouse (sometimes known as the page forward and page back buttons for internet browsers) wear out easily after only a few months of usage. That means that it requires extra force to register a button press, all while receiving no touch (or audible clicking) feedback. Frustrating but the mouse does continue working.

Con Uncomfortable "seam" where your thumb and palm meet
Con Sharp side buttons can irritate fingers
The sharp side buttons can irritate fingers and cause distractions while playing.
