David unboxes the Keyron M5, an ergonomics-first vertical mouse that quietly packs top-tier gaming specs (PAW3950, 30K DPI, 8K polling) for $70. He tours the shape and buttons (including the second scroll wheel), runs through the browser-based software, tests latency, and lays out why this might be the first vertical he actually wants to game with, plus a few nitpicks on clicks and finish.