I have a Razer deathadder right now, the latest normal edition (the matte, non-RGB one). Really good mouse, not gonna lie, but the clicking feels really slow and it gets me killed in the competitive FPS games I play way and it happens way more than I'd like to admit, since the darned thing cost half the money my GPU did. I know somebody is going to tell me I shouldn't have spent that much for a mouse, but I got the keyboard for free (friendship forever yay) and I'd rather play with 1080p @ medium settings in most modern games than use a mouse with acceleration.
I would mainly use the mouse for Battlefield 4 and Counter Strike: Global Offensive. I think I would get a benefit in other games as well, since imo the click really matters, probably more than 6,400 dpi and 4G acceleration, while I have my mouse set at 1,800 dpi and 0G right now. I could opt for a cheaper solution, but I believe the final mouse is my best choice, since it incorporates ergonomics, a good click and a no-acceleration sensor.