Summary: I liked the concept, but a left/right trackball is too awkward to use. I had a previous trackball that I liked many years, so I bought this one to try. From previous experience, the thumb has enough dexterity to manuver in all directions allowing the hand to rest on the trackball and the rest of the fingers free to press the various buttons. I will try a more normal right handed trackball.
Summary: I bought this a few years ago because it might be more ergonomic that a standard mouse. And it actually is. I didn't see that there is no scroll wheel until after I started using it, because I thought even a $5 mouse has a scroll wheel. Scroll wheel is extremely essential in web browsing and other works today. So it's useless to me and sitting on the shelf now.
Summary: Even though the ad said that it would work with my computer, it did not! The installation disc did not work and could not get help on line. Very disappointed--The cost to send it back was very high and TigerDiect would not cover the cost of the return postage! A very dissapointing transaction, indeed!!
Summary: I own 3 of these trackballs. I have used them for over 10 years when you work field service you don't always have a great place for a mouse. the trackball more often than not I use it on my knee. You do have to remove the ball and clean often and the only other problem I have had is if the ball falls out my cats love to play hockey with it, but I have never lost the ball for long.
Summary: I received this mouse for use at work and find that it is way too small for my hand. Also, the lack of a scroll button is a huge drawback for me. I have had the TrackMan Wheel and that one is perfect for me. T In fact, after only a few hours of use, the wrist is in worse shape than while using a regular corded mouse. I am unable to rest my hand on the mouse and have it feel comfortable like I can the TrackMan.