Summary: My father bought one for playing Myst around 1998. But, it was a serial model and kind of had to die with that computer. So, when I bought my laptop, I got a USB marble mouse. If you get hurt and can't use your dominant hand, the symmetrical design makes it just as easy to switch sides. I tend to be a daredevil, so I have had occasion to need this capability. And it's very portable. It doesn't matter where you work. It will stay put. The drawbacks are minor.
Excerpt: I have been using these for years on my computers (desktop and laptops) and love them. Easy to use and setup in windows. Just purchased 2 more for new computers. Shipped fast also and a great price.
Pros: Accurate Controls, Easy To Clean, Ergonomic Layout, Fast Response, Smooth Movement
Summary: I have a very cluttered desk so my mouse was not getting frustrating to use. I bought the trackman thinking it would just be a capable substitute, but it exceeds the mouse in every way except scrolling... Find a way to improve the scrolling and it's pretty much perfect.
Summary: I've struggled with ergonomics as a CAD designer for years. I spend the majority of my day in front of a computer and a clean interface to my computer is essential for my productivity and my health. The trackman marble is the ULTIMATE in ergonomics and usability. I can make large mouse movements by spinning the ball and, once I'm generally where I want to be on the screen, switch to using my fingertips for fine mouse control.
Summary: My brother got me my own computer n 07' with a trackball mouse. I feel in-love with that mouse, wish I still had it, this will do though. At least they finally are showing the one with the ball with the trackball in the ball in the middle of the mouse. I tryed the one that uses the thumb, it was not helpful.