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.

Moving forward, for personal usage on a gaming rig, I would look elsewhere. As a device for productivity, I don't think it can be beat if you have the option to use Trackballworks (I would so buy one for usage at a job with an assigned station, your coworkers have less of a tendency to get grabby!).

Excellent accuracy; and granular control of functionality within the driver software (Trackballworks)

Trackballworks; Functionality is mostly tied to the driver software, as the extra buttons aren't recognized properly within Windows 10 or Linux Mint without it (no experience with this mouse in prior versions of Windows); The driver software impairs compatibility with a lot of the games I tried.

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.

After ordering this item along with a motherboard from this site i was so surprised to see it sitting on my doorstep the next morning, also exited because they were the last pieces of my most recent build. The packaging for the mouse was decent if not better than most.

I however had sent it back for one reason though, it felt really cheap; even though the ball itself had some weight, the rest of it felt so incredibility cheap under my hand; the scroll wheel and the buttons were made out of really light and thin plastic and it felt as though i would certainly break...

Kindle? No, I wasn't looking for one of these. Ebook (eBook? ebook?) readers have always been seriously lacking in both design and function, as well as services. Kindle seems to be different, however.

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.