Why I buy this one ?
- Award-winning Scroll Ring around the trackball makes scrolling quick and easy.
- A user says - One of the most eloquent designs of any input device on the market Largest ball of any of the mainstream, consumer trackballs Trackball has great momentum and virtually frictionless rotation.
- Largest ball of any of the mainstream, consumer devices
- Great momentum and virtually frictionless rotation
- Detachable wrist rest cradles your hand in comfort, Windows or Mac compatible

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What our customer's say!

"The ultimate trackball", I have owned one now for 6 months, and I can say without a doubt that this is the ultimate trackball and maybe the ultimate hand-input device for a computer besides the keyboard. If they were a little less expensive I would buy a few more for work and other computers I have, but if the one I had broke, I would replace it in a second. If you are an experienced computer user and you want a great trackball or mouse alternative, this gets my vote for the best option if money is no object. Anything cheaper will have some drawback or another, this doesn't have any drawbacks other than the higher initial price.

"Smooth action", As always, this Kensington trackball is smooth as can be. My only negative comment is that they have gotten rid of their direct launch buttons. I switched to trackballs years ago to help with the ergonomics of my set up and having those buttons was a huge help.

Great functionality here.

"Best of All Trackballs!", I purchased this as a gift for my husband. The box, when it arrived, was surprisingly heavy. We opened it up and found that the thing is HUGE. The ball is about the size and weight of a pool ball. It has an optical movement, so perhaps it won't be plagued with the problems that he had with the Kensington TurboBall(for no discernible reason, the TurboBall, no matter how often he cleaned it, would periodically glitch out where the cursor would only go in straight lines- horizontal or vertical- and it drove him nuts, eventually back to a regular rodent). This trackball, he says, is great. He is enjoying it a lot, and the huge ball is very comfortable to use, as is the scroll wheel. An added bonus is that the buttons are programmable, so he can truly make it work HIS way. Good news indeed- I know that I will have something to go to when my beloved Microsoft Trackball Explorer (no longer manufactured) bites the dust!

"Indispensable trackball", After using this trackball, it is absolutely frustrating to be without it! I even carry it along with my laptop!
No more running out of space on your mousepad in the middle of an operation and having to start over.

"Great improvements on a great product", I have been using different Kensington Expert mouse products for almost a decade, and have gone through quite a few of them. This new optical version is great because you don't have to take out the ball and clean the rollers anymore, and the ring-scroll wheel is awesome.

Read this reviews before You buy...

"Best Mouse in 20 years on computers", I LOVE the Kensington Expert Mouse. I tried a lot of other trackball mice and every one of them caused some pain in my hand or wrist. I use this mouse for 5-15 hours a day and have no problems.

I just bought another Expert Mouse because I thought it was wearing out. It turns out the problem was the program, not the mouse. So I'll use my perfectly good 2 1/2 year old mouse for my backup computer.

I've been using an ergo beads pad to brace my wrist but this time, I'm trying the support that's provided with the mouse. So far it's working fine.

I have purchased these since they weren't optical. I have to admit, the models before optical wore out within a year. Once Kensington replaced one and I bought two others...one a year. Comfort is very important to me; at the same time I'm glad they improved the design!

I keep compressed air next to the mouse and every couple of days lift out the trackball and blow away any lint that collected on the knobs that hold the ball.

"Kensington Roller Ball Mouse", A fellow co-worker had used this mouse and I thought she was crazy. This isn't necessary, I thought. When she left the company, I inherited the mouse and thought I would give it a try. Now I won't work with out it. I have since taken a new position and am now working from home and needed to buy one for my home office. It is awesome. Highly recommend!!!! You'll never go back to the tradtional mouse.

"Surprisingly, disappointed!", A little background: I first discovered the kensington track ball back in the early '90's while studying for my Computer Science degree. It was the greatest, coolest idea I had ever heard of relative to the PC accessories world, and ever since then I've been yearning for my own. I never really had the extra money to justify paying a $[...] for a glorified mouse, so I just waited. Meanwhile, years later, I chose the Logitech Cordless Trackman Optical. Finally, I seized the opportunity to buy this Kensington (a month ago) due to a $[...] off sale.

After using my beloved Expert Mouse, I'm not as thrilled by it as before. Over the years I think some companies have caught up and implemented a better "trackball". I'm a freelance photographer and need the precise tracking and functionality for my graphics programs.

1. All the buttons are basically the same. The same feel, the same basic shape. You can't learn the different buttons thru touch other than the 4-corner positions. The Logitech Trackman does a much better job than the Kensington on this.
2. The "reach" for the top two buttons is difficult due to the size of the ball, especially when your fingers are moving from the bottom two. Having a different texture or noticeable shape would help when you're blindly trying to control (or orient) the mouse.
3. You CANNOT program the ring!!! This is so ridiculous until its beyond me! The wheel on the Logitech is fully programmable, AND can be pushed down just like a mouse button for even additional functionality! I used to be able to assign the "ring" or "wheel" to zoom in and out on some of my graphics apps, but no more with this Kensington. I am really disappointed in this.
4. The "ring" does not track accurately in one of my apps and feels cheaply put together (that's the only part though). In scrolling up and down, sometimes you'll have to move the ring over a couple or three "notches" before the page will move, then the very next "notch" will advance the page correctly. It should move the page with each "notch". For a $[...] mouse this is unacceptable.
5. Mouse buttons are too soft. In resting my hand comfortably on the trackball I constantly "trip" the buttons because of this. Very irritating. I'll be looking at a web page, and then all of a sudden the browser will go back to the previous page because I've inadvertently pressed the "back" button.

I'm gonna try and adjust to it, but I've been seriously considering going back to the Logitech. Oh, the Logitech is $[...] regular price. I bought this one for $[...] after rebate and still feel that I paid too much.

Hope this helps someone!

"Kensington Expert Mouse", Trackball is very smooth. The scroll ring works great! The design keeps my hand and wrist from getting tired or sore. I'm using it with a MAC computer. I would recommend it for anyone looking for a trackball type mouse.

"Kensington Expert Mouse", I love it. I was having a lot of difficulty with my traditional mouse. I couldn't seem to get it to go where I wanted, but with the Kensington Trackball, I don't have that problem. It has made my life so much easier. I highly recommend it for anyone who has difficulty manipulating a regular mouse.