As an unspectacular, functional foray into the world of optical mousing, this is a well-priced mouse with a good shape and feel, as well as a nicely-calibrated scroll facility.There's little point in installing the bundled software, as any version of Windows from 2000 onwards will pick it up and detect it as an optical scroll-wheel mouse without problems, and allow you to tweak all the necessary settings through the default 'mouse' dialog box in Control Panel.The 'pointer jumping to random points on the screen' peculiarity is usually a feature of the mousing surface you use. Use too-shiny a mousemat and the optical detector picks up false reflections and can make it think the mouse has moved a significant distance. Keep the alcove clear of dust and use a fabric surface to 'mouse' on and it should be fine.Overall a good little mouse and one that I enjoy using for high-speed games without complication.