Summary: I use this trackball mouse every day. There is no comparison for stability, accuracy and speed. Once you've gotten used to a track ball you will not want to go back to chasing a regular mouse all over your desk.
Pros: Accurate Tracking, Comfortable Design, Fast Response, Great Features, Stable, Works On Any Surface
Summary: This is my first trackball. Got it a month ago. Using it on my laptop that comes with touchpad + "button" cursor. Learning Curve ============== - Less than 30 minutes to master the trackball-to-cursor coordination.
Summary: My Trackman Marble+ went bad and I got this as a replacement. It just doesn't fit my hand as well. The Marble+ left my wrist above the surface the mouse rests on, but with this, half my palm rests on the table. It is higher in profile and steeper. It does not accommodate your entire hand.