This is excellent for people w/ carpal tunnel or other "grip" problems. The grooved circle around the ball is great for scrolling. Regular mice strain my thumb & wrist. But if you need a mouse for gaming, this is not it. The gamers in my house hate it.

Ive used the various incarnations of the Kensington Expert Mouse for nearly as long as Ive used a pointing device on a computer yeah, I was a late adopter of Windows, I held onto DOS as long as I could. No mice needed with DOS!.

Large ball; smooth motion; easy to clean

Hard to find out there, except for some specialty stores, or on line; Misleading name! Why is it called an Expert Mouse ..; when its a trackball

Bought two. Been using this for years after some elbow pain using regular mouse. No more problems & large ball is easy to maneuver. Plug it in & it works.

This is the eighth Kensington trackball device that I've happily owned over the last 20± years. Having just purchased my 10th Mac-the new iMac 21.5", 3.2 GHz-I naturally "tried" Apple's new wireless bluetooth mouse.

PROS: Large ball, smooth ball movement, comfortable design, large programmable buttons with great software, scroll wheel great IDEA. CONS: Tracking slightly jumpy at times. Scroll wheel is such a terrible design it feels and often acts 'broken'. Reviews are correct about the scroll wheel.

I use this without the wrist rest, it's a very comfortable mouse to use. The scroll wheel is a great feature. The software was easy to install on to my mac so you can then add functions to the extra two buttons, such as copy and paste.

Expensive-so very expensive-BUT-so good, so very good. If you use a trackball, then this is one of the best, easy to configure, big ball makes for precise movements, keys are big enough to hit easily.

great product! other then the the scroll ring stopping clicking this holds up and is easy too clean and just as accurate as the day I bought it.

Expensive-so very expensive-BUT-so good, so very good. If you use a trackball, then this is one of the best, easy to configure, big ball makes for precise movements, keys are big enough to hit easily.

I have several of the Kensington Expert Mouses. Everytime I use a a regular mouse, it reminds me of how much I love the Expert mouse. you never have to pick up and reposition a traditional mouse when you cant get to the edge of a page.