Overall, while these updates will only appeal to a limited audience, for those who own an IntelliMouse, there's no reason not to upgrade and every reason to do so. With Universal Scrolling, scrolling exceptions, several new configuration options, improved performance, a variety of bug fixes, and, with the latest IntelliMouse update, support for both Windows 2000 and Windows ME (Millennium Edition) all available in a free download, what are you waiting for?
Pros: An essential upgrade for IntelliMouse, Universal Scrolling and adv. customization
Cons: Only useful if you have an IntelliMouse with IntelliPoint 1.1 or later