At first is seems too small to be comfortable, but after 30 minutes or so you notice that your hand is very comfortable, in fact I have trouble going back to the large mouse. It has a 800dpi track so it's very precise. The only con when I use it on my Kensington wrist/mouse pad (that has a very black and some what fuzzy soft surface) diagonal movement will sometime be a little jerky, but on any other surface, even my jeans when I am sitting at the local coffee shop it is dead on.
Josh