the BEST and the WORST
I'm a long time trackball user and have tried every one out there. When I saw this design I thought this would be the ultimate in beauty and functionality. The unit is a work of art, and the ergonomics are great. The best part is the smooth fluid and accurate motion of the ball. So that's the best part, the worst is that Kensington has preprogrammed the buttons and they say they do not plan on a software upgrade to make the buttons do anything other than to use for music and pictures. This I think was a major mistake as so many users could use those other buttons to make their daily use of programs easier than the use of only 2 buttons. So if that's important to you I'd look elsewhere, or hope Kensington comes out with another model like this one that you can configure the buttons to your personal needs. Other than that it is the best mechanically I've ever used.
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