You can move the arrow to limitless locations on X and Y coordinates, but doesn't have a Z axis function. The round finger rest was spinning, so I super-glued it and now its solid. The top surface was kind of slick, so I coated it with pine tar. Now doesn't fly out of my hand all the time.
It's also very hard to operate with your foot.
I had no mouse pad and used a slice of pizza (not recommended). Beware, it's not dishwasher safe!