Summary: I purchased three similar products from Amazon simultaneously and received them today: Kensington Expert Mouse Optical USB Trackball for PC or Mac 64325 Logitech Trackman Marble Mouse Kensington K72337US Orbit Trackball with Scroll Ring for PC or Mac This is for a Mac. My large hands and my wife's small hands explored using all three devices. Our feedback on these products is in relationship to the other ones. -The Kensington "Expert" Mouse was too big and clumsy.
Summary: The upper buttons are a bit hard to reach sometimes, too, and their position makes it hard to hold down a button while using the scroll ring. The buttons are also all extremely loud, for some reason. In a cheap, ringy plastic way, not a good way.
Pros: We have used these at our recording studio for ages - they are very versatile and use much less space than a mouse. I've been using a Logitech Trackman Cordless for ages but I finally got fed up with changing the batteries and the poor reception. Honestly, if Logitech made a non-cordless version, I would pick up another one of those in a heartbeat.
Cons: Kensington has made a lot of compromising design choices in an effort to keep this a dual right and left handed device. The scroll ring is terrible. Kensington goes on and on about how great the 'precise fingertip scrolling' is in their marketing material. Using it mostly requires more than one finger, and is always accompanied by a grinding plastic-on-plastic sound. They really should be using teflon or steel ball bearings and give the scroll ring some weight rather ...
Summary: To begin, this is the fourth trackball I have owned. The first two were the old putty colored ones I used with my older Mac's and were much better quality. The last two were both the newer model K64325 - dark grey. For those contemplating a purchase, the ''stiff'' ball loosens up very nicely after an hour or so of use and is silky smooth. The scroll wheel is a different story. It is cheesy to say the least.
Summary: At first, I was impressed with the mouse because it was easy on my arthritic hands. The software is incompatible with Windows XP Professional 32 and 64 bit version, and Kensington tech. support knows this, but they have no viable fix for the problem. I spoke with some guy in India who barely understood a word I said. Because the software corrupted my registry, I had to do a system reset. It took me 2 days to restore the computer back to the way it was before the crash.
Summary: Under Windows XP and Mac OS X this trackball has an extensive set of features using the Kensington Mouseworks software. All the buttons tcan be programmed and the wheel (ring) can be adjusted easily. Under more current incarnations of Windows and under Linux, this becomes a very expensice simply input device. The trackball DOES work, but because there is no Mouseworks software for these OS's the device cannot be easily configures to behave as you like.
Summary: 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.
Summary: Often product design engineers in this country don't consider carefully what's already ideal about their product when they go to "improve" it - Yes - better manueverabilty & new optical tech is great - but you gave us something that worked all these years & in an hour my hand ached & i knew something was wrong with this latest mouse - had to mis-use wrist muscles in a way the earlier designs had not.
Pros: 12yrs of addicted custom
Cons: abandoned, Abandoned past ergomomics, Changed angle shape, Changed to small ball, Uncomfortable Design
How Kensington's awesome product became obsolete over night
M. Durand "Hacker for Hire", Amazon
23 August 2007
Summary: If I were still living in a Windows XP world, this trackball would get 5 stars. If I were only considering Kensington's attitude toward Vista support, it would get 1 star. Here are the words straight from the horse's mouth: "With the release of Microsoft Vista there is no further need for the Mouseworks application as key features and functionality formerly provided by Mouseworks is incorporated into Vista.