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: 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: 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: 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: 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: 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.
Rating:
Summary: Extremely functional
Review: While I don't use any of the buttons except for the bottom two (which are the typical right/left buttons on a mouse), I find this mouse to be extremely useful. First, it's a trackball mouse. I personally find regular mice to be hard on my wrists (and somewhat annoying over time as the mouse become less sensitive.) Second, this mouse can be adjusted so that it is not only extremely sensitive, but also useable. Although every mouse can be set so the cursor flies across the screen, this mouse can be finely set so that you not only have an extremely fast mouse, but also one that is manageable in terms of stopping the cursor. All in all, I find this to be the most functional mouse (in terms of speed and positioning of the cursor) that I have ever used. The biggest downside is that it is quite large.
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