update so far: although this is probably the most responsive & lowest latency mouse I've ever used, I'm not sure if it's better than some 1k mice with better shape and features. the difference is noticeable, but not significant.
the shape of the viper v2 pro is very SAFE, if you're not super picky about shape and weight, the mouse is great. however, I think for most players, you will aim better on a shape that's perfect for you even if it's 1k Hz.
at minimum, you should be playing at or above 240Hz to warrant purchasing this mouse or trying it. I would personally just recommend sticking to your fav 1k Hz mouse until 4k becomes the new industry standard & a better shape for you becomes supported.