If you frequently switch between using a mouse and a touchpad you might run into an issue where the sensitivities/speed of the cursor between the two devices doesn’t line up quite right. That means every time you go from using a mouse to a touchpad you have to go into the Control Panel to change the sensitivity to make it tolerable.
There is a free Windows app called AutoSensitivity that will automatically adjust the sensitivity/speed for you as you switch between the different pointer devices. It’s a pretty basic app, but tackles a problem that could otherwise get pretty annoying.
Note that if you want to stop the app from monitoring for the connectivity of a mouse you’ll need to quit the program using the icon in the System Tray.
AutoSensitivity Homepage (Windows only; Freeware)