Same boat as UrbenLegend, it's noticeable when playing FPS's. It's like the latency you experience when playing on modern game consoles, if you don't notice it, then that's great for you, but oncenyou get used to the low latency responses of PC gaming, it's really hard to go back, not so much for how it impacts how well you do, but because the latency suddenly feels like you lack control.