When comparing Mad Catz RAT 7 vs Razer Lachesis, 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 Razer Lachesis is ranked 74th. 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
Ranked in these QuestionsQuestion Ranking
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 Braided cable
Helps prevent kinking, curling and protects the cable prolonging life of mouse.
Pro Ambidextrous
The Razer Lachesis is an ambidextrous mouse.
Pro Shape and size good for medium to large hands
The Razer Lachesis is a great mouse for those with large hands. With the hump where the users palm rest being a bit further back than a lot fo other mice it makes a good fit for those large hands.
Pro Custom color lighting
Using Razers Synapse software users can customize their color lighting.
Pro On the fly DPI switching
There are two buttons under the scroll wheel that allow for on the fly DPI switching.
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 Horrible lift-off distance
Lift-off distance is advertised as 1mm, which is not true, it's more than half an inch.
Con Unreliable drivers
The mouse freezes, lags and the mouse pointer might even die.
Con Unreliable CPI switcher
On-the-fly CPI scale resets, and sets to wrong settings often.
