Summary: This is my 3rd one. Would not have any other. You don't move the mouse, you just move the ball with your finger tip, that's it. No medical problems from moving a finger. They usually last about 2 to 3 years, but for the price, who cares.
Excerpt: I've never liked mice. I always thought a trackball was the solution for me, but by the time I bought my first computer, trackballs weren't very popular. At that time the first one I could get my hands on was the Logitech Marble Mouse, and I have been using it and its successor (now called the Trackman Marble; B&H carries them) ever since.
Pros: Accurate Controls, Fast Response, Scroll Ring, Smooth Movement
Summary: I bought this trackball for work, as my desk is extremely cramped & I really do not have room to move a mouse around. I love trackballs, but found that this one didn't have a 'scroll option'. So, I ordered the next grade up, one with a scroller that runs around the ball & Love It More!!! So, this one is at home now & my new Kensington is helping me at work!
Excerpt: A couple of months ago, I paid about thirty dollars for a Kensington Orbit Optical Mouse . This trackball mouse is one of the best input devices I’ve ever owned, or so I’ve discovered since I first attached it to my laptop. I hate laptop mice. My Compaq has a touch pad, which isn’t very comfortable for me to use. The Orbit Optical plugs into one of my USB ports and begins working without any further effort.
Excerpt: I decided to buy this mouse to replace an old mouse that had started to die out on me after about 4 years of use. I prefer using a trackball, even for gaming, it's just more comfortable for me. I wanted a scroll rings since my previous mouse didn't have one, so this mouse caught my eye. The trackball itself is smooth, the mouse installed itself into the computer no problem. The scroll ring works great for browsing.
Summary: This is my second Kensington Orbit Trackball, the second only because I spilled a cup of coffee on my last one, and that one had lasted for 2 years and was still working fine until the coffee incident. I love the trackball, so much better than the conventional mouse that you have to move the entire unit around. Try a trackball....now this one I use my index finger. I have used the one that is operated with the thumb, but didn't like it as much.
Summary: I have used a trackball mouse exclusively since 1998, and only used one model, the Logitech 910 (gray mouse, red ball) which is pretty much the standard go-to mouse. Mine finally gave out and I saw this one was similar and about $15 cheaper. The transition has been seamless. Ergonomically this one is shorter so my palm doesn't rest as high. It took me about an hour of use to get used to it and then I forgot I was using a different model.