The BenQ Zowie EC2 has a good CPI range, although it’s not as wide as other gaming options. The sensor tends to undershoot the CPI a little, but not by much. You can switch between four CPI presets by pressing a button at the bottom of the mouse. Likewise, a second button on the bottom lets you cycle between three preset polling rates: 125Hz, 500Hz, and 1000Hz. Because there’s no companion software, you can’t customize any of these values.