Ranked in these QuestionsQuestion Ranking
Pro No mouse pad required
Works on a variety of surfaces, such as glass. You are even able to use it on your lap.
Pro Amazing battery life
Logitech promises a battery lifespan of 18 months off of a single AA battery.
Pro Works fine via USB-hub
Con Learning to use the thumb to control the trackball might take a while
Most trackballs are finger-operated, and learning a new to control the mouse might take some time.