x3Razer is overrated.
I guess they made a good mouse, the deathadder, but i personnaly feel it's too light.
Iv had a mouse and a keyboard from them and the quality of the materials they use is very low.
As an exemple, i think the Razor Blackwidow is poorly made. (Cheap plastic for a 100$ keyboard)
Would not recommend.
If you used the Deathadder 2013, the Older Deathadder Black, 3.5G, and etc. are comparitively much more heavy I've heard.