This monitor exists for one reason: if you play competitive games where every millisecond matters, you want the motion as smooth as physically possible. At 400 refreshes per second, moving your crosshair feels like it's glued to your hand instead of trailing behind it. That's twice as smooth as most gaming monitors and four times smoother than a regular screen.
It's a 24.5-inch 1080p panel, which means it's not sharp by today's standards — you'll see individual pixels if you look close, and text isn't crisp. But in fast shooters like Valorant or Counter-Strike, that trade-off makes sense: your PC can push way more frames at 1080p than at higher resolutions, and the smaller size means less eye travel between minimap and center screen.
No HDR, no fancy extras. You're paying for refresh rate, not picture quality. If you're not chasing competitive rank in fast games, you don't need this.