[hugh3]

The article is confusing because it starts off talking about USB security issues, which are irrelevant.

The main advantage of not having a mouse is that you wouldn't have to have a mouse. One less thing to carry around with your laptop, one less thing to take up space on your desk.

That is, of course, assuming this could be made to work just as well as a mouse, which I doubt. Few things are as momentarily frustrating as a mouse that doesn't register your movements properly, which is why trackball mice sucked so much.