What are some alternatives?
When comparing MouseImp and Caldis MOS, you can also consider the following products
Scroll Reverser - Scroll Reverser is a free app for Mac OS X Snow Leopard and Leopard that reverses the direction of...
Smooze - Smooze animates your scroll and adds functionality to your non-Apple mouse (scroll-wheel mouse).
ScrollNavigator - ScrollNavigator helps you to scroll your documents horizontally and vertically. Simply click and hold down the right (or the middle) mouse button anywhere in a window and move the mouse to scroll the window contents.
Mac Mouse Fix - A simple way to make your 3rd party mouse better.
DragToScroll - Allows you to scroll any window or control by right clicking (RButton) and dragging the mouse.
Smoothmouse - Smoothmouse is experimental project to improve mouse & trackpad usability in OS X.