As best as my memory serves, this is Razer's first foray into the world of vertical mice. It's released plenty of ergonomic models before, to varying degrees of success, but Razer has thoroughly avoided going all sideways until now. That's probably because vertical mice generally don't make for excellent gaming rodents, but demand for them has risen, which is why Keychron released the M5—one of the best vertical mice I've ever used and surprisingly decent for gaming.
However, neither the Keychron M5 nor the Razer Pro Click V2 Vertical Edition are great for gaming. They're not easy to move about, and because you click buttons horizontally, rather than vertically, frantic button mashing will result in the mouse nudging slightly to one side. With prolonged experience, you do get used to it, and I'm sure there are plenty of PC gamers out there who would thrash me in a round of Counter-Strike 2 with a vertical mouse.
