KensingtonOrbit Trackball Mouse (K64327F), Silver/Black

Have been using a Logitech trackball mouse for years. Unfortunately, they discontinued manufacturing that model and the price for the remaining stock is ridiculous. I noticed this mouse as I was looking for a replacement. It is basic, but more than serves its purpose. It's comfortable to use, easy to install, and works well. More than worth the cost too.

I used to be a trac ball fan, but this mouse out performs the more expensive trackball.I love the ball on top. This is my 2nd one, as I have 2 laptops.

My old one had earned retirement - paddle contacts wore out. The new one wants to lean forward just a millimeter; a bit awkward, and the ball feels a bit looser than the old model. That said, it works just fine. I adjusted my grip just a bit so my palm keeps the back end down, and my fingers touch the ball slightly higher than before. Just minor adjustments on a fine product at a reasonable price.

Having used the Logitech trackball for years, but when it was time to replace Logitech's prices went too high. So, recently tried the Kensington with the Ring and found it to be too wide for most hands here...to the point of being uncomfortable and clumsy. Decided to take a chance on this one without the "ring" and what a difference! The width is just right and the ball moves ever so smoothly and quickly and stops easy too! It is being used on a Linux O/S and absolutely no problems. Highly recommend this mouse.For those who need to know the size width:The narrowest part where your hand lies across the top (to click either left or right side of mouse) is approx. 2.25 inches. Compared to the same brand with "the ring" which is approx. 3 full inches. Also the highest height of the ball on the "ring" model is 2.50 inches and on THIS model it is a half inch lower. SO you can see by these measurements this model is much more suitable for smaller hands, or hurting/stiff hands.Additionally, other reviewers stated that the trackball is loose and falls out...I too noticed that my trackball was not seated all the way in. I took it out and examined it and saw that there is a clear piece of plastic that was stuck on the ball and had rolled to the under side of the ball. It was hard to see because it was clear and had black writing on it and the ball is a very dark gray. I think this piece of plastic had some warning on it -- maybe to remove before use...but it was difficult to see. Now that that is removed the only way I can remove the ball from its place is to turn the mouse over and it gently falls out so that you clean/dust it off. It never just falls out or pops out...unless something is in the way.Its a great little mouse...thinking about getting another one!

3 month Update - From 4 star to 1 starAt this point, I pretty much have to give this a solid "thumbs down". The mouse "snaps" or clicks every time you move your finger from front to back. Repeatable, every time. As I mentioned earlier, either the unit's plastic collar for the ball has expanded, or maybe there's a spring behind the rear tab that failed. This mouse allows just WAY too much excessive movement, to the point where every "down" effort causes the mouse to snap or pop. It's not single movement, either. It's a backwards and then upward movement, every, single, time. It' annoying, though it doesn't appear to impact the actual function, e.g. the movement of the mouse on the screen appears faithful. Add to that, every once in a while, the mouse freezes, and loses touch with it's software driver. I have to unplug the USB and replug it. It's an "OK" mouse, and could have been great. Someone in engineering design just cheaped out with materials, to save 50 cents, I suppose. I won't buy another. I'll try something else. Who knows, maybe with the chance in the tariff environment, someone will start making quality computer mice in the USA again. (Just use the Logitech trackball as the design, clone it, build it with original METAL switches, and you'll sell a million of 'em.)---------------Original reviewIt took a bit of time to adapt from the old Logitech Marble Mouse (MM) I've been using for 20 or 30 years. For one, it's shorter and broader. My large hand fingers don't naturally drop to the L/R keys the way they did on the MM. I have to reach back and wider to find them, but that's mostly a retraining issue.Technically, this is a VERY good mouse. Extremely smooth rolling ball, but at a cost. Where as the MM has multiple metal points suspending the ball in a relative snug fit, this trackball just kind of sits loosely in a cradle. And, that's where this mouse, after a couple of month's use, is probably a "fail". I can't tell for certain, I'd probably have to have a new one to evaluate side-by-side, but the cradle appears to have a plastic tab in the back, which limits the forward to backwards movement of the ball. It's not doing that anymore. There is now SIGNFICANT movement of the ball, front to back. The impact is that whenever you're finger is moving from slightly top center to rear, the ball "snaps" backward or forwards. It doesn't remain snugly in place. It's still mostly an annoyance, but it does impact control of the mouse movement to some extent. Again, I'm not sure if this is "as originally delivered", or if it's become damaged with use.Would I buy this again? Well, it's the best Logitech mouse replacement I've seen. Maybe. Not certain. I need a couple of more replacement mouses, so I may give this a second try.What's really a shame, is that some "big political boss" in the new Logitech ownership "somewhere in Asia" decided from an ego perspective, to ignore the wide and deep market for the MM, and discontinued manufacturing them. In fact, since they bought out Logitech some decades ago, their newly designed version was a cheap piece of crap, anyhow. The original had metal contact points in the switches for the mouse keys. Their new ones, plastic, which wore out in about 6 months. They saved 5 cents on a 20 cent part, and destroyed the original reliability. (Had the original mouses for 10 years before they failed.) So, on the plus side Kensington (ACCO Brands in San Mateo) appears to be making products in response to consumer demand. I hope they build and improve on this mouse design.

I have used rollerballs for decades, so obviously have had several! NONE have been as beautiful to look at and as smooth to operate as this one! The ball is like floating on air! so comfortable, and I know it will reduce hand fatigue. HIGHLY recommend this rollerball mouse!!

I was testing this out for a replacement mouse (the other kensington mouse with scroll ring) that I wore out. as I was setting it up, I turned the device upside down. the ball fell out. I was not expecting that, I've never seen a ball fall out of the socket. when I did plug it in, I noticed a difference in performance. this device has a 'floating' feel to it, does track faster but it's different from every out device I've ever used. buttons seemed to work as expected, did not seem to have a cheap feel but the lack of scroll wheel was a deal breaker for me. I absolutely need to page up/down in things and automatically went to move in the document/page. that was the 1st and last time I had this plugged into my computer.I don't think this is a horrible device but it def was not for me