Rating: 
Summary: Carpal Tunnel be gone!
Review: After 20 years as a heavy computer user my right arm, elbow and wrist just started to go. I immediately started paying attention to ergonomics. My three best purchases were a good chair; the MS split keyboard and the Kensington Expert Mouse Pro. Although I see some complaints here about quality, mine has functioned flawlessly for over a year now (knock on wood). The ball pops out easily for cleaning with a soft cloth and a squirt of compressed air cleans the contacts. Two minutes to clean the thing. I switched to trackball to start mouse-ing with my left hand. The transition was easy. The Kensington was easy to install, configure and use. The mouse has four easy-to-program action buttons and a scrolling button. I set mine to left-click; right-click, double-click and show running applications. Since your hand rests on top of the ball it's easier to click the buttons and a lot less stressful on your wrists. Pressing once for double click is a godsend. "Show running applications" allow me to hide the task bar and gain another 5% of screen real-estate. There are also 6 buttons on top of the mouse that will activate any task you want. I'm using mine to pull up a couple of favorite web pages and applications. Since my MS-Natural keyboard has a dozen buttons I'm finding I mouse a lot less and my wrist and arm have healed. I've also learned to use the "windows" short cut keys, especially CTRL-a,x,c,v (select all, cut, copy, paste), The Kensington menu also has click speed, scroll speed, rest reminder, pointers, and acceleration and movement options. I find the rest reminder very helpful. A custom message pops up at your pre-set time to remind you to get up and move around! I've got the movement set to snap to the default button on the page which is usually very handy. I'm not sure why some users are complaining about the scroll button. I agree with some users here that the scroll button takes some getting use to since the scroll button makes this a 5 button mouse! But, you can set one of the action buttons to auto scroll as an alternative. I set the scroll speed to "very slow" and that helped a lot (1.8 Athlon here). The mouse does take up 8K in background processing, but in this day of 128K RAM that should not be a problem. Overall, I am very happy with my purchase and my wrists are estactic!
Rating: 
Summary: Best alternative to mice, but still lacking
Review: My old CTO swore by the original Expert Mouse(all white) and replaced them every couple of years as they tended to not last very long. When the new Expert Mouse Pro appeared with scroll bar and quick launch buttons, I requested one through my IT department. Here were my observations: Pro's:
(1) The best alternative to regular mice, period. The biggest and smoothest trackball there is. Very easy to use and great on the wrists. (2) Good looks. Con's:
(1) VERY pricey. For what it is, I have to imagine that Kensington is making a killing on these. The price is too much to bear for me to purchase it personally. Given that I spend more hours computing at work than at home, it's appropriate that I need it at work, but not at home. (2) The scroll wheel is not placed in a convenient spot, thus I found myself not even using it. (3) Quick launch buttons. Again, not very convenient to have to raise your entire hand off of the trackball to push the buttons. (4) Not "solid" as the original. The original seemed better made and was heftier, thus would not move as often as the Pro version. Summary:
I am ALL for ergonomics, especially for those who make a living at computing. I own a ...Kinesis ergo keyboard which I find invaluable for everyday use. It's not great for games, but at least it helps me to break my gaming habit :) With the right combo of seating, monitor placement, keyboard, and mousing, you should be able to effectively avoid RSI. The Kensington product is great for that purpose, but the cost will be prohibitive for some, in some instances. The Expert Mouse with some modifications and lower price, should be the office worker's pointing device of choice.
Rating: 
Summary: kensington expert mouse pro
Review: This is probably the best mouse i've ever used.It needs frequent cleaning but it's not a big deal.Maybe I.m messy?Price is a little high but it's worth it.
Rating:
Summary: Great trackball for the computer
Review: I know many people prefer either a mouse or a trackball. Sometimes both. This review is mainly helpful for those accustomed to the trackball especially the older Expert Mouse Trackball (K64215). I recently bought this trackball for use on my G4 Macintosh at work. Since the trackball is USB-ready, there is no need for an adapter. The Expert Mouse Pro is just a larger version of the older model with many, newly added features. The six buttons at the top act as shortcuts linking you to files, applications, and/or websites. This is extremely handy. Adding and editing these features is easily done through the control panel for the Expert Mouse Pro. The location of the buttons is a bit awkward because you have to move your hand up from your working position to push the buttons. The scroll knob is handy for moving up and down the window. My only problem with the scrollling knob is that the trackball just below it makes it hard for you to access it since it elevates your hand a bit too high. The trackball, itself, glides without any problems. It's smooth and responsive. The color of the device (grey) may not be to some people's liking. The large size and shape of the Expert Mouse Pro may not appeal to those who like small, more aerodynamical input devices. Overall, this is a wonderful device that is not without its own minor flaws. But if you are willing to overlook those details, the Expert Mouse Pro is a great input device for your computer.
Rating:
Summary: LOVE IT!!!!!!!
Review: love mine... i have one for work that sees VERY HEAVY USE. i got it after a couple of our ITS guys recommended it since i do a lot of programming & desgin in addition to accounting... this product works equally well with both Mac & PC without any difference between the two. The buttons & scroll do not work on either system for me, but that is because i have a KVM to switch back & forth between my two systems & those do not play well when you mix Mac & PC programming... if i hook this up to one or the other system, it works awesome on both, however. My hand used to get stiff or go to sleep on me with an old mouse, but not with this.
Rating:
Summary: Good product, but poor quality
Review: I like this trackball; it saves a lot of arm and wrist action compared to a mouse, and uses less desk real estate. However, the quality is just abysmal. My first one failed after a few months, and Kensington replaced it under warranty (shipping me a new one immediately, not waiting until I returned mine). My current one is getting ready to be returned, as the main button is starting to stick. The product looks and feels cheap, which is appalling given its price.
Rating:
Summary: A lackluster follow-up to the world's greatest trackball
Review: Kensington took way too long to come out with a USB version of their award-winning trackball, and when they did, this let-down was the result. The scrollwheel was an awesome addition - but you need to grow a 6th finger to use it... it should have been on the side for use by the thumb. The 6 buttons on the top are just fluff... a way to boost the price on the mouse, while not accomplishing anything beyond a click to your personal bookmarks in your Web browser. Ptooey. In order to follow suit with the trend of blue and other colored plastics, Kensington used this bluish plastic ball that has almost no traction whatsoever. You can spin the ball until you hit bone before you can move the cursor. I had to take the beige trackball from my older ADB Kensington mouse in order to navigate with this thing. Still a superior option compared to a standard mouse, this was a major let-down from the company that brought the best trackball on earth to Mac users.
Rating:
Summary: Good for work, but pricey for home
Review: First let me say that I love using a trackball vs a mouse. I have been using the Kensington trackballs for years. BUT I'm getting tired of replacing them every couple of years. It's OK for work where someone else is footing the bill, but at home I'm switching to a Logitech. I have a Logitech Marble FX for my laptop, and it has lasted longer than my Expert Mouse Pro. I just got the Logitech Cordless Optical Trackman for my desktop. It also has mulitple buttons that I can reprogram to do what I used to do with the Kensington. Maybe it will wear out given the usage my desktop gets, and if it does I may go back to Kensington, but I can buy 2 Logitechs for the price of one Kensington...
Rating:
Summary: Good features. Could be more durable, more ergonomic
Review: Short review:
Features: A+ (nobody better)
Accuracy: B+
Compatibility: A+
Configurable: A+
Durability: B
Ergonomics: B (but still better than most) Let me start by saying that I'm appalled by how much I use my comptuer. Between work (consultant for web databases and groupware both Mac and PC) and surfing (I'm here, aren't I?), my comptuer time has really squeezed out my TV time. Every two years or so it's time to buy a new Kensington trackball. Why? Because Kensington is the best bar none (and yes, I've tried tons of them). Ergonomics is huge with me so let's start there: Trackballs are easier on the wrist and arm than mice are. If you're at your computer for more than 8 hours a day, you already know this. Mice are too much work. Thumb-balls and finger-balls are not precise enough (and also put a strain on the rolling finger). Nope, Kensington has done it best so far and I've been using them for 8 years now. So two months ago my old Turbomouse gives out. I'd been popping the ball out twice a week to "de-gum" it and finally the vertical wheel just stopped spinning. It was only two years old (but remember, I'm averaging 12 hours a day). While I loved my turbomouse, the new "Expert Mouse" called to me and so I answered. It's great. I got the wireless model programmed all the buttons (a huge time saver) and started using the mouse. Right away I hit the biggest problem with the mouse. When I used my old turbomouse, my hand enveloped the ball and I could rest my entire hand. But this device requires me to hold my hand above the ball. Kensnigton compensated for this by suppling a "wrist rest", a thin plastic shell that feels weird and doesn't give enough support. You really need one of those thick foam wrist rests they give out at conventions (which is where I got mine). Also, even though it's only two months old, I'm already getting the skipping that I didn't use to get until the mouse was a year old or so. This does not seem to be as durable as my old turbomouse. The good news is the features: I'm at the point where programmable mouse buttons are MANDATORY. ESPECIALLY in the one-button Mac world where it's option-click this and control-click that. The wireless function is extra nice since I can move the trackball without having to untangle. The best features, though, are the new launch buttons. You can program macros or launch applications through them. A+ A+ A+. But I still kind of miss my turbomouse and if Kensington continues to make them, I'll probably end up buying one when this one dies out. Enjoy!
Rating:
Summary: The expert mouse rocks!
Review: Up until a couple of months ago I was a hard-core mouse user. I wouldn't even consider a trackball. Then, I started having problems with motor control and sensation in my hands (there were other symptoms but they are not necessarily germane to this discussion) which made using a mouse very difficult. After going to doctors and being subjected to numerous tests I was diagnosed with multiple sclerosis. For the time being, the worst of my symptoms have been reduced dramatically down to almost nothing. Take my advice, early detection and treatment is the way to go. My doctor says that with a little bit of luck old age will take me out before I become totally disabled. The only symptom that is currently bothering me is my hands. Motor control has returned however I still do not have much feeling in my hands. That's where the trackball came into play. This trackball has numerous programmable buttons that have greatly improved my ability to use my computer. Now, I wonder why I never tried the trackball before. Even with my disability things are easier than they were before. At least as far as using the mouse pointer is concerned. For those who have disability in their hands I highly recommend this track ball. In combination with a good voice recognition software package it cannot be beaten.
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