Its 800 DPI before negative acceleration occurs, not 400. And the polling rate also can have negative effect when high on a mouse, because if you get high enough FPS on a low polling rate mouse, it can remove all bullet spread increase due to mouse movement; but that requires like steady 250 fps on a traditional 125Hz polling rate mouse. For high tech 1000Hz, you can't get that effect.

ET was never designed for high tech mice. You just want good quality and condition for ET. That's why I like my razer diamondback 3g (set to 800 DPI) because it is nice feel, easy to click, and always responsive, without having a bunch of extra tech in it; great for ET.

I love how knowledgeable testforecho is.