Excerpt: I use trackballs for years and tried many models but the thumb control trackball is not my favour because my thumb will get tired easily. I skid to say the advantages of trackball over mouse here. I am using Kensington Orbit Trackball with Scroll Ring and supposed to upgrade to Expert Pro, but love the Orbit more. The big advantage of Expert Pro is the large trackball. It makes the moving is much precise.
Pros: Accurate Controls, Large trackball
Cons: Cheap Made Quality, Occupy Large Desk Space, Scroll Ring Is Noisy, Scroll Ring Not Smooth
Summary: The first Expert trackball arrived faulty. (Customer service replaced quickly - Thanks). The second trackball did not work with my PC. And the TrackBallWorks software not only did not help, but made my Kensington Obit stop working as well. After a lot of back and forth with Kensingtion Tech Support, I finally got the software completely removed from my PC and my Orbit trackball working again, and finally even the Expert trackball.
Summary: Most of the time, it works great. But now and then the buttons switch off. For example, have to right click instead of left click. Once in a while, the scroll ring will go wild and go from the top of the page to the bottom instead of smoothly. I am very disappointed and will have to clean my desk so can use a regular optical mouse again.
No Vista/Win7 software, uncomfortable, ring tracking bad
Amazon Customer, Amazon
12 December 2009
Summary: I had a Kensington Expert Mouse many years ago, and loved it. When I needed a new mouse this week, I ordered another one, and it is a COMPLETE DISAPPOINTMENT. First, the software and drivers that come with it are from 2001-2003. And it doesn't work on Vista - there is NO Kensington driver available for this mouse for 64-bit operating systems (Vista & Windows 7). UNBELIEVABLE.
Summary: I wanted a trackball to ease the pain in my wrist from mousing and remembered the excellent Kensington Expert Mouse that I used to use with my PowerMac 7500 years ago. That was a fantastic mouse. I had read the reviews here for and against this model and thought I would purchase it despite the preponderance of negative reviews. I wish I had paid attention to the negative reviews... this Expert Mouse works nowhere near as well as the old one.
Summary: 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 can't understand how Kensington allowed and continues to allow this expesive trackball to ship this way.
Summary: Great Trackball, poor design. Using the Trackball makes you bend your wrist backward too much. The top of the ball is quite a ways above the table making it awkward to use. The Trackball system is excellent. The pad supplied does not raise the wrist anywhere near the right height to use this comfortably. You need almost a 2 inch thick pad. You could raise the area in front of the Trackball a couple of inches, but the unit is expensive and that shouldn't be needed.