Rating: 
Summary: One of the best trackballs out there
Review: A review from a gamer:Pros:
- Five buttons (including the scroll button)
- Button configuration is ideal (for two or three fingered clicking)
- Easy to clean (easy to remove the ball, and contacts are easily accessible)
- Fits hand perfectly
- Wired (a pro because of the lag caused by wireless products) Cons:
- "Sticky" fine movement Overall:
For those of you who haven't tried/had the patience to try a trackball mouse, they add comfort and ease of movement to your computing life. This trackball is the best five-button, thumb-controlled one out there. The only place it is lacking is its "sticky" fine movement, but sensitivity configuration can solve that problem. This Microsoft trackball has proven to be useful because of its easily accessible five buttons, and ease of cleaning. If you do not want to take advantage of a five-button trackball, I suggest buying any logitech trackball, which offer three-buttons with ease of movement. Although, without proper cleaning, the Logitechs movement will become stickier than that found in this trackball.
Rating:
Summary: Not as Bad as some people would like to make it out to be.
Review: A few things are REALLY starting to bug me about reviews of this trackball. #1. People. There is SOFTWARE to help you adjust the settings of the trackball. If you don't INSTALL and USE this software, well, hell, your mileage probably won't be as good as most people's who use this very decent (though NOT flawless) unit. PLEASE. Do us ALL a BIG favour and don't start ranting about stuff you can fix yourself, because most of the orientation, sensitivity, etc, problems can ALL be adjusted well assuming of course, the unit is NOT defective, which also can happen in a few cases. You could TRY to be reasonable - though I know it's LOT to ask from some people. Some people expect total perfection to just pop out of every item and box they buy and then get all miffed when that doesn't happen. #2. The next significant complaint revolves around the ball itself (not soft enough, pops out, isn't stable enough). It's true that Logitech trackballs do outscore MS in this respect. They tend to be anchored and positioned better, and the physical makeup (the material) of the balls themselves seem to be less prone to sticking. I've almost ALWAYS been able to work around this by setting the software to increase/decrease the sensitivity, but everyone knows that you can pop the ball out, clean it, and also do some cleaning of the contact points inside. This is the SAME with the Logitech trackball, so you WON'T be able to escape it completely. As to the light/heat issue, I haven't had problems with it. This may be an up and down thing depending on the batch of trackballs made - so I can't say for sure. Personally, I like it. When the optical sensor picks up movement, clean movement, the light lights up, allowing you to check to see if things are working properly, and whether or not you need to clean it. End of story. #3. It's not just about the trackball anymore. I didn't buy this unit because it was a trackball. I was actually looking for a DECENT regular optical wired mouse that would fit my hand. I used to use a Logitech MouseMan+, one of the original two-button with scroll mice used about 4-5 years ago. That unit fit my hand PERFECTLY. However, the only one that was reasonably similar in shape was the Wireless MS Intellimouse Explorer, and I was looked for a WIRED version, which didn't have the nice contouring effect on both the MS AND Logitech mice, like say, the MX 300 or 500. However, even the MX series do not possess a long or smooth enough curve for my hand to fit as perfectly as before. Even the Logitech Click(!)s are rather pathetic, they do not fit the natural contours of the hand very well. They are just cheap knockoffs. The MS optical Trackball is the only NEW unit that felt REALLY comfortable in my hand, and I can live with very minor quibbles about the trackball so long as my hand doesn't suffer. I'm REALLY surprised that Logitech's equivalent units (trackballs included) couldn't sway me from this. My past experience with Logitech units, both Mice AND Trackballs has been excellent, until now. Sorry Logitech, MS has beaten you out this time by sticking with the basics (if you'll pardon the very horrible pun). If MS improves on the ball then they will own this market segment very soon.
Rating: 
Summary: The Best! for Carpal Tunnel Sufferers
Review: This is absolutely the BEST input device I have ever used in my 20+ years of computing. I have severe carpal tunnel syndrome and this is the first mouse/trackball that has not caused me wrist pain after using it for hours. For anyone who is stuck in the pattern of index finger for left click and middle finger for right click, the thumb activated trackball makes the shift from using a traditional mouse an easy one. The trackball is also great for those who have to do a lot of "mousing" in a small space. It gets tiresome after awhile to keep picking up the mouse and moving back in order to get more scroll room. (Although I think Microsoft's Intellimouse Explorers are also the best for CTS sufferers if you can't get used to the trackball). The only negative about this item as far as I'm concerned is that I haven't been able to find a wireless version. I hope Microsoft is not going to leave us CTS folks behind.
Rating: 
Summary: Still too small
Review: 1 review said it was too big. That was 1 BIG lie in fact this is too small most mouses are too small for my hand but i heard this was big but at least it was better
Rating:
Summary: Wonder Ball!
Review: This fantastic mouse, is the best and most creative I have ever used. The rollerball is great, no need for anymore grimy mousepads. The mouse fits your hand perfectly. It features a scroll knob to scroll up and down pages without having to move the arrow to the side bar on the screen. It has buttons to tab webpages back and forward without having to move to the back and forward buttons on the browser. The time saving buttons and features are amazing. I have a tough time going back to a regular mouse after this luxery mouse.
Rating:
Summary: Really nice product
Review: We have had this trackball for about 18 months. Everyone in my family loves it. It's very precise and easy to use even for the kids. It has programmable buttons and the scrolling feature is great. We would never have thought about replacing it (except for a cordless trackball) EXCEPT our toddler is now at an age where she can do things and play her games and she is a LEFTIE. This trackball is user friendly ONLY to right handed people. Poor thing can barely use it but she is trying to use her right hand and I don't want to force her to do something uncomfortable. So we are going to replace this with a new trackball that allows use for EVERYONE in the family, both lefties and righties.
Rating:
Summary: Great Mouse, but Super-Sized
Review: I loved everything about this mouse except for the fact that it's way too big for my hand. I had to return it and get the smaller Logitech. A lot of the reviews here talked about how great the larger size was -- I'm assuming they have really big hands. For all people who are more petite, this mouse may seem like you're using a basketball for a mouse.
Rating:
Summary: what a trackball should be
Review: It's comfortable, a comfortably subdued color, and featureful (in a good way). With a trackball that fits my hand so well, good optical technology so that I don't need to worry about dust and stray hair getting into the works, a scroll wheel, and programmable buttons, I'm addicted. It's even relatively sturdy. The only way they could make it better is to make it cordless without needing batteries. I'm still waiting for a cordless trackball with a recharging cradle.
Rating:
Summary: A Much More Natural Feeling Trackball Mouse
Review: The first time you use it, you'll think you'll never get used to navigating using your thumb, instead of index finger. After using it a week, you'll wonder how you ever did it any other way. It feels odd for a few days, but you'll eventually find you can move quickly and more accurately using your thumb. Trust me. I've got limited desk space, and got tired of picking up and putting down my optical mouse. With this mouse, you never need to slide across a mouse pad again -- a real asset for those of us with cluttered desks. The shape fits naturally in almost any sized hand (one reviewer noted that it fit his large hand well; I have a smaller hand, and it fits mine just as comfortably). The side buttons make it possible to scroll back and forth between web pages much more easily, but, to be honest, after stumbling around on them the first few days (I would mis-click the smaller buttons instead of the left button), I hardly remember they're there and still find myself using the back buttons in the browser instead. If you're a furious surfer, though, you may find it really useful. It wasn't anything I based my buying decision on. The ball itself moves smoothly and with a good deal of accuracy. It tends to get dirty over time, and you may sometimes find yourself giving it a rapid spin in frustration --but the ball pops out easily enough, so with a good wipe and quick blast of air at the cup, you'll be on your way again with no problems. It may not look as cool as some of the others, and it may lack some of the bells and whistles, but if you're looking to replace your existing mouse with a hassle-free, nonsliding, get-the-job-done model, you can't beat this one. Take it for a spin and see.
Rating:
Summary: I love it
Review: Ever since I had Logitech's "Marble Laser", I started liking track ball mice better. Takes some getting used to, but you don't have to pick up the mouse off the desk ever again. It's got great response for games, and works well for programs like "Adobe Photoshop". I used to get sore wrists from using a mouse to play games all day long. Be it from holding it the wrong way or gripping it too tightly. Ever since I've used this kind of mouse I've never had that problem. Don't believe anyone that says this isn't as good as a regular mouse. They just haven't really used it that long. I've used trackball mice now for 8 years.
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