KensingtonOrbit Trackball Mouse with Scroll Ring (K72337US), 4 1/2X5 1/2X2"

I love the Kensington Orbit Trackball Mouse! It’s super comfortable and reduces wrist strain, perfect for long hours of work. The scroll ring makes browsing easy, and the customizable buttons are a nice touch. It took me a few days to get used to the trackball, but now I can't imagine going back to a regular mouse. Highly recommend for anyone looking for ergonomic comfort!

No complains. It would be great if when pressing the trackball it would work like pressing the mouse wheel. That would be a good feature. But it's just a suggestion.

I love the scroll wheel, the buttons could be a bit more refined, I feel like they require a deep press. Overall, it's a great size for on-the-go.

I've had the trackball for about a month now. I bought it to replace the wireless Mighty Mouse that came with my Mac 'cause it ate batteries like no tomorrow. VERY, VERY pleased with the trackball. It took me about a week to figure out how to comfortably use it as I had exclusively using a Wacom tablet in place of the mouse, before deciding to get some sort of mouse.The software: To start off, for those reading reviews of those complaining about the program, you CAN plug and play it. You don't actually need the program for the trackball to work. The mouse adjustments that you can make in the System Preferences will still work for the trackball. However, in order to access the additional features, you will need to download the software. It's a very easy process, just go to the website, download and install it (the instructions come in the packet). The icon will show up in your System Preferences window under the Other header. I don't know where it appears for Windows as I've only transferred the trackball between our Macs. In the trackball program, you can adjust the usual features (scroll speed, click speed, etc) and also the left/right combo click which you can set to do stuff like go back or forward. The program also allows you to choose which direction to have the scroll ring turn to go up or down. The default is set to clockwise for scrolling down.The buttons: overall, they're pretty standard in function. However, I do find that sometimes in certain programs like a Flash game, it won't always want to click on the first try, so I wouldn't recommend this for gaming purposes for games where you do need an immediate response. All other uses, I haven't really noticed any problems. I love the option of being able to set the dual click to do something :) As a first time trackball user, something else I also had to remember to do was take my fingers off the ball before clicking as I often catch myself nudging the ball when I click and then missing the spot I wanted to click. Same goes for the scroll wheel. I seem to subconsciously fiddle with that too.Trackball: No issues with it at all. It took some getting used to with adjusting from a mouse or my tablet and I found myself trying to click on the ball itself a number of times. *lol* But no fault of the device.The scroll ring: So far, I haven't experienced any of the major problems that have been complained about so far. Up till about a week ago, I hadn't gotten around to looking into the trackball's software and once I did, it made a huge world of difference with how smoothly the ring scrolled. It felt a little slow, previously to the point where it sort of staggered sometimes. I love how I can now just give the ring a quick flick with a finger and I'll be back at the top of a web page. I've actually caught myself trying to do that with a scroll wheel on a mouse at work and wondering why it just inched up instead of flying up where I wanted it! Keeping in mind of the complaints though, I have been careful with the wheel and trying not to use it when I don't feel I really need to, as not to potentially abuse it to death as I really like it. So if I'm scrolling to skim an article or search it for something, I'll use the scroll bar on the browser, which with the trackball is pretty effortless.Extras: It includes a wrist rest that you can attach to the end of the base. I didn't bother with it as my desk has a built in one.Size of whole unit: it's a decent size for me. My hand length is about 7 inches and the size of the unit allows me to perch my fingertips on the ball and comfortably roll forward to the middle joint of my fingers if I want to do one long continuous drag. I've play tested some older trackballs in stores many years ago when the majority seemed to be a lot larger, so this works fairly well.Advice: if you find yourself needing to clean your trackball, don't use Clorox wipes. It leaves a sticky residues that slows down the ball's spin. I just pulled out the ball and washed it with hand soap and water, wiped out the dust in the holder, dried off everything and stuck it back in.User troubleshooting: If you find that your hand is more tired using the trackball than a regular mouse, try adjusting your chair height. This can make a very big difference. If you have an arm rest on your chair, take advantage of it and adjust your chair height to make the rest level with your trackball.

Kensington mice are my to go to but the one I have been using only would last me a year before the left click would take on a mind of it's own and do whatever so we will see how this will respond. I guess I am just a heavy clicker but all the same feels great and works great.

This trackball isn't terrible, but it could be so much better. The price point is attractive, and the addition of a scroll ring is welcome. It is also nice that it is ambidextrous, since many of the higher-feature trackballs are for right-handed users only (at least with Logitech). The device itself is deceptively small and lightweight. For some reason when I looked at pics of this online, it always looked as though it were a large and bulky chunk of plastic. It is not. In fact, I found the Orbit to be very small and very low to the desk (in other words, it was not very high at its highest point - the trackball). Logitechs seem to rise up to support your palm before they curve towards the buttons. Overall, their models just seem taller on the desk compared to the Kensington. For me, the result was that my hand was splayed open all the time to hit the buttons, and it was much lower to the desk, with my wrist hitting the edge causing discomfort. There are ways to work around this, as Kensington supplied a little rubber wedge that slips on the end of the trackball housing to lengthen the supported area for your hand and wrist. This support simply slips on to the end, and there is a tiny rubber catch that hooks on the bottom of the trackball. The catch doesn't lock the pad onto the end of the Orbit, rather it just helps keep it lined up. At first this support was very uncomfortable, but after a few days, it became less so. I found that the support seemed to stay on the trackball fairly reliably.One of the great features of this trackball is how smoothly the ball rotates in its socket. After a hour or so, I felt hardly any resistance or friction, especially when compared to my Logitechs. I also liked how you could just plug it in and use Windows to configure the features for you. Kensington provides its own software for download, but I ran into several snags getting it to install and run on Windows 7 64 bit, so I stuck to the Windows drivers. It only has two buttons, which was fine by me, so that wasn't a turn off for me.The downsides I found with this trackball were the extremely light weight of the device (I found I was accidentally moving it during usage), and the overall cheap feel of the unit. The housing felt very flimsy to me, and the largish buttons made a hollow, cheap sound when clicking. They also require a bit more force to depress than other trackballs or mice, so double clicking got to be a bit tiresome after awhile. The scroll ring, which worked perfectly for me seemed cheap too; it had a plastic-on-plastic rubbing noise to it, and although it moved without resistance I wondered how long that would last. Another reviewer wrote a piece on here telling about how he took his Orbit apart and put graphite lubricant under the scroll ring. Its an intriguing thought, and if I had the time and truly loved this trackball, I might have tried it myself.All said and done, I didn't hate this trackball. I probably could have lived with it if there weren't other choice out there (granted, not many choices, which is a shame)that met my needs better than the Orbit. For me, it worked flawlessly with the Windows drivers. It just wasn't my favorite.Edit 7/22/2012Well, I reacquired one of these Orbits, and followed that aforementioned reviewer's advice. I never really had a scroll wheel issue, but depressing the buttons was problematic, fatiguing, and ultimately uncomfortable. As he suggested, I opened up the trackball and glued two plastic shims cut from a zip tie to the plastic 'plus-sign' contact points under each button that hits the actuator (I believe that's the term). I used Loctite super glue which has held well, but I also have Plastruct Plastic Weld which I will try if it doesn't hold. After letting it sit for about 12 hours, I put it back together.Like the original reviewer, I, too, found the shims a bit thick. When the housing was screwed down the button were permanently activated. I simply loosened the front two screws slightly, and the buttons required far less effort to activate. So, I suppose with the modding done, I would add a star. But I won't do so officially for this review because it came from Kensington needing to be modded in the first place (at least in my opinion). But I hope this helps.

Works great. I like the scroll wheel collar for use with middle finger.