this is strange compared to a normal mouse its going to take some time to get used to, but since i have virtually no desk space because of stuff on my desk i cant move a mouse anywhere
it uses optical sensors to track the ball, i don't know what the "resolution" as such is, making precise movements is pretty tricky - but thats probably because ive not used it much
saves having to move a mouse around, although the placement of the buttons could be better.