The problem I used to have with touchpad devices on notebook computers had to do with the tap-to-click function. When I would pause typing to think (should probably have done that more often), my hand would touch the touchpad and click it, thus moving the cursor somewhere else. When I resumed typing, my characters would go into some random place in the document. I turned off the tap-to-click function and resolved that issue.
The Samsung CB has that turned off by default and has a press-to-click function that is not prone to accidental clicking with just a light touch. It is the best all around touchpad device I have used.