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.

Love this mouse. I have been searching for an ambidextrous wireless trackball for a while and was hesitant to spend the money on the Kensington Expert Wireless trackball. There should have never been any fear. The button placement is perfect and the trackball glides effortlessly.

This trackball was awesome until I upgraded from XP to Vista 64 & then Win 7 64 bit. The driver/software is not compatible & they have no plans to make it compatible. It only works as a basic mouse under those systems, no programability. Under XP it was great with tons of options.

Function; Programability; Looks

Price; Mouseworks software not Vista/7/64bit compatible

This my 3rd trackball mouse. Our first trackball was on our 8100 Mac and it was great. This one is the best. I wished I had bought it for the I-Mac sooner. The scroll wheel really make this one worth it's price. Editing Word documents and Excel spreadsheets is a breeze.

I love this trackball. It is very comfortable to use. It is much faster using a trackball than it is a mouse. It is more precise than a mouse. So if you are using CAD or photo software this is the best type of pointing device. I highly recommend this trackball.