Customer Rating: 
Summary: ditch your mouse and rock the greatest pointing device ever made
Comment: Hands down, Logitech's trackball is the best pointing device ever made for a computer. PC, Mac, Linux... Accurate, durable, no-frills. I've used one at home since 2000 and one at work since 2003 -- still using the original in each case.
Customer Rating:
Summary: Best mouse
Comment: I ordered this mouse after I already had two other mice that I have had for 9 years. It is the easiest mouse I have ever used. No pushing it around on the desk. Just move the ball and it rolls so easily. My kids love this and will not use any other. The best mouse we have ever had and will not use or order any other type, I am ever thinking about order one for my laptop.
Customer Rating:
Summary: Dependable and Durable workhorse
Comment: I'm an engineer with a medium size company in Texas that designs and manufactures pneumatic conveying components such as diverter valves, slide gates, and rotary feeders. 75% of the time I am on my computer doing 2D and 3D cad work with AutoCAD and AutoDesk Inventor. I also use Adobe Photoshop and Autodesk's Maya quite a bit. I switched from a mouse to a trackball about 6 years ago for the ergonomics and increased precision.
I have owned (3) of these guys - the original at work, the one I bought for my home PC because I liked the one at work so much, and the new one for work that I bought recently. The only reason I replaced my old one is because, after 6 years of heavy use, the rubber pieces that kept it from sliding on my desk had disappeared.
...And, when I say heavy use, I mean heavy use. I can't count how many times I have knocked it off my desk, or slammed a fist down on it in frustration (if you do CAD, you understand). It keeps on going, despite my abuse. I also put greasy, dirty hands on it sometimes, when I am in a rush. It works through the grime accurately and cleans up easy when you have time.
As with anything Logitech, you can expect good support, great functionality, and a long life for your product.
Also, for anyone doing similar work, I would recommend a spaceball from 3Dconnexion. One of these guys in conjunction with your Logitech trackball will streamline your work. Increased efficiency... Less fatigue... You will wonder how you did anything without them!
3D connexion SpaceExplorer 3D Navigation Device with USB Interface ( 3DX-700026 )
Customer Rating: 
Summary: The only choice!
Comment: My Microsoft Trackball Optical is pretty much worn out, and I needed a thumb action device again. I tried the Apple mouse with my new Mac and started having arm trouble again. I found that it this point the Trackman Wheel is actually the only thumbball you can still buy. I also remeber now why I did not buy one years ago when I bought the Microsoft one, the Logitech is smaller physically. My hand has since made the adjustment, but I wish there was a thumbball that was larger than this one.
Customer Rating:
Summary: Logitech Tracks On-Target
Comment: I have been using the Logitech Trackman Wheel Optical on all my computers at work and at home for years and have never had one fail! I purchased this particular one to replace one which I gave away to a friend with 'coordination issues.' This is a great device, which fits perfectly into my hand.
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