So, no ones reply even after 15 hours, because Razer sucks
I owned two of their mice, the first mice scrolling wheel died after year of usage.
while Razer mamba 4G is too damn heavy, the side rubber peeled off like banana skin.
random malfunctioning.

TL;DR version: buy Logitech gaming mouse, affordable and much longer warranty.

I owned 2 of their mouse, and was deeply disappointed by the quality.
If you have deep pockets and don't mind to be the victim of poor quality products, go ahead.

Now i'm using G602.

For wireless gaming mouse, Logitech only have G602 and G700s.
G700s is rechargeable while G602 can put large capacity rechargeable AA battery, which can last for months of usage.

Personally i find G602 is more comfortable to use, and not so expensive.