When comparing Mad Catz RAT 7 vs Steelseries Sensei, the Slant community recommends Steelseries Sensei for most people. In the question“What is the best gaming mouse?” Steelseries Sensei is ranked 24th while Mad Catz RAT 7 is ranked 37th. The most important reason people chose Steelseries Sensei is:
There are many settings including acceleration, polling rate, and others that can be changed from software or the built-in LCD. You can customize the 7 buttons to do whatever you like.
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
There are many settings including acceleration, polling rate, and others that can be changed from software or the built-in LCD. You can customize the 7 buttons to do whatever you like.
Pro CPI switching
You can change between 2 different DPI settings via a convenient button located below the scroll wheel.
Pro Ambidextrous
Both right-handed and left-handed people can use the 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 Bad driver software
The driver software is buggy and crashes often.
Con Somewhat poor grip
The material the mouse is made up of can be slick especially when using with sweaty hands, something that often happens with prolonged use.
