Summary: I'm a big fan of trackball mice and have owned a few different models and this one is a very solid option if you don't want to dish out a lot of money for the high end ones.
Pros: I have been using this mouse for more then 4 years and it is still very responsive. Usually the ball on the mouse would not roll smoothly after as much use as I have put on this one. It's long design fits my hand very well. Good support for the inside of my palm
Cons: Limited Features and the two secondary buttons are not placed well.
Summary: I bought one of these earlier mice back in 2000 and have been using it ever since including right now. These early ones where actually made in the time when Windows 95 was the only operating system available.
Summary: I have a newer model marble mouse but my teenage son was a bit rough with one of the buttons and it double clicks for every single click. This was a decent replacement for a product that new is still running at $30.
Excerpt: I really like this "mouse"...it's large and comfortable in your hand. I had to get use to it as you control it with only your fingers. Very easy to use and moves well and accurately! No complaints!!
Summary: Allowed me to transition to a stand up desk. Used to use a keyboard touchpad. Now I rely on the Marble. If it gets slow or sticky, I pop it out and rub it on my shirt and then when I pop it back in, it glides real smooth. Its got lots of features but I just use the basics.
Excerpt: I have always preferred a trackball to a mouse. I have used other trackball products, but I prefer the Logitech TrackMan Marble Mouse to other trackball products. I find the ambidextrous, ergonomic features a definite plus.
Summary: Have not used a regular mouse in over 10 years. First logitech trackball I had was a Marble FX Optical Wireless, unfortunately they don't make those anymore. Having used a trckpad for a couple of years, I get cramped fingers and was ready for a trackball again.
Pros: Having fairly large hands, it still feels quite fitting. If you have really large hands, this one might not be fore you. Software is very useful and buttons can be programmed to do anything you want. The best thing this does is force your wrist not to lay flat, but more into a (near) handshake po...
Cons: No scrollwheel, of-course knew that when buying. Wish the scroll ball was somewhat larger for more precision. Small buttons are hard to get to.