The DA sensor is considered perfect in every way. No prediction, positive or negative accel and great tracking. Definitely better than the G9. The only problem is there are 2 super common issues with it: The left click might start double clicking on every press, and the mouse wheel might get really skippy (scrolling down might scroll up, then down really fast) later on. However, as far as mouses go, the DA is by far the most popular for good reason.