Logitech Optical Marble Mouse (USB/PS2)
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Beneath that black-dotted burgundy ball lies the secret of the Marble Mouse's responsiveness, longevity and reliability. An infrared emitter and optical pickup track the movement of the ball, not mechanical rollers which quickly become gunked up with skin oils and dust. You'd have to let a really thick layer of crud accumulate on the ball before you'll see an impact on the Marble Mouse's performance. Small enough to tuck into your notebook, laptop or PowerBook's carrying case, the Marble Mouse is pure computing bliss compared to jittery trackpads, wobbly finger sticks and erratic rollerballs.
PC users running Windows XP and earlier can simply install the PS/2 adapter and plug the Marble Mouse into the PS/2 mouse port without installing any software. With Windows 98 and later, you can pop off the PS/2 adapter and plug the Marble Mouse into a USB port. Macintosh owners running Mac OS 8.6 or higher will need to install MouseWare from the included CD-ROM and disable the Macintosh Mouse control panel in the Mac OS Extension Manager.
Unlike its more expensive TrackMan siblings, the Marble Mouse is fully ambidextrous, with equal-sized buttons on both sides. The included Logitech MouseWare (also downloadable at www.logitech.com) makes the Marble Mouse behave like a 3-button mouse on PCs (you press BOTH buttons together to access the functions of a third button) while giving Macintosh users one-finger, one-click access to content menus (shades of Windows, eh? :) ). Windows users also benefit from the new page up/page down buttons located just above the main buttons.
Finally, though the price might seem steep compared to a $5 mouse you could pick up at Best Buy or CompUSA, recall how many of those cheap little rodents you've owned and thrown away in the course of a single year.
The best Trackball out there
I used to use a Kensington Trackball, because at the time, it was the only one designed to be manipulated with your fingers, instead of your thumb. The optical marble mouse does the Kensington one better. The "optical" part of the title says it all. There are no rollers or little crevices for hair and gunk to get caught up in under the ball. I spent more time cleaning my previous mice and trackballs than anything else! Whenever that cursor starting jumping around the screen and skipping over the places I wanted it to go--I knew it was time to ditch the mouse and get a new one. This optical marble mouse has no rollers. It is very easy to keep clean--and so far (8months) I have had none of the problems of my previous mice. The accompanying software for this trackball also has some nice shortcut features. I have one button programmed to instantly "minimize all open windows." A really nifty trick if you have to blank your monitor quickly.....like when the boss is coming around :)
Stop chasing that mouse!
A high quality ergonomic choice
1. Because it's a trackball, you don't have to move your wrist as much as you would with a mouse.
2. The buttons are placed so that you can click with your thumb, which after all, is stronger (less likely to get injured) than your index finger.
3. It's symmetrical, so you can switch back and forth from using it with your right hand or left hand - that gives your mouse hand a rest.
I echo the comments of others that the optical trackball works great, and almost never needs cleaning. Also, I agree that it stays put nicely on the desk. Yes, this mouse was very different when I first started using it, but very very much worth getting used to it.
4 years and no turning back
It took about 1 week to get used to it, but after that learning curve was through, I was so convinced, that I haven't used a mouse extensively since. In fact, when I started a new job, the first thing I did, was buy another Marble Mouse, so that I wouldn't have to struggle with a regular mouse at my workplace.
Except in extreme situations, hand fatigue is a thing of the past for me and the marble mouse I bought four years ago is still working perfectly.
One trick is to set it up so that the right button is the main button and the left button is the context button. In use, I press the right button with any combination of my pinkie, ring finger or middle finger. By distributing the clicking duties between three fingers, the muscle usage is more evenly distributed and repetative motion problems are not a problem.
In fact the beauty of this design is that it is so simple that one is able to use it however you want to. Other trackballs that are overly molded to fit your hand end up causing problems because they force your hand to be in a particular position all day long.
It is also easy to switch between left and right hand use -- though I almost always use right hand.
I do have to clean it during the day, but this is extremely easy. Basically I just pick the ball out of its socket and flick away any dirt that has built up. It takes about 15 seconds and no special cleaning solutions or anything.
If I was running a company, I would make everyone try one of these out for a week. They are amazing computing tools and would be standard issue for all computers if I ran the world.