Kensington Orbit Trackball Mouse (K64327F), Silver/Black

The first thing that impressed me was the thick cardboard packaging. Super protective. Opened it up, was surprised that the ball was so loose. I had been used to ones that held the ball in, even if dropped. Plugged it in to my 2004 Lenovo computer, heard that sound, you know what I mean, acknowledging it. Put my hand on it, rolled the ball around, and nothing happened on the screen. No matter what I did it just didn't work at all. I was disappointed. In the evening I took it to the bedroom, plugged it in my 2014 Acer laptop on the off chance it might work, and whaddaya know?! It worked perfectly! I'm very, very happy with it! It will live with the laptop and my other trackball will stay with the computer. Other than the looseness of the ball, which I can live with, I love this trackball!

I have used these track ball mouses for years and these are extremely sensitive to your movements. Especially in combination with increasing/changing the sensitivity in your settings, if you like responsiveness and already have some good hand eye coordination then this could be really great for you. For people who want something more straight forward and don't have the patience then I don't recommend this. This tracker ball is actually amazing for gaming and the in office use (after almost using these for ten plus years) because the ergonomic design prevents hand cramping, and you never need a dumb mouse pad, or run in the trouble of moving the mouse off the mouse pad because you never have to move your arm around for it! I love how both left and right hand users can use this mouse equally, the design makes for incredibly easy movements that are not interrupted by any weird grooves or even the placement of your other fingers. I noticed many ppl didn't like this flexibility and the placement of the ball, as it is not fixed into any one positon and can easily be removed and picked up. But this is something that actually makes cleaning the inside of the mouse (removing dust from the sensors and keeping the mouse on a smooth roll) incredibly easy and actually maintains the sensitivity of the mouse, since there is less friction between other parts of the mouse that slow you down. Also if you are constantly pushing the tracker ball with too much pressure or too close to the edges in a lifting motion, of course it will pop out, it happens, and definitely not often, it takes practice to use and if you don't find it comfortable and don't hate mousepads and the problems with conventional mouses enough to learn a whole new kind of hand eye coordination then maybe it's not for you. These have sped up my work and reactivity so much, so even though this unfortunately doesn't have a scroll option, this is not really gonna be a deal breaker, especially when it's super easy to scroll down with the key board. That is the one thing I wish they would fix about this product if it wouldn't mess with the design of it!!

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.

We were trying to replace our old Logitech ball mouse, but that brand's price has shot through the roof, over 200$. My wife has small hands, and most other trackball's are verry award for her. We were verry pleasantly surprised at just how comfortable and responsive this mouse is. The speed and accuracy are fantastic! If you are looking to replace a Logitech at a much better price, you definitely won't be disappointed, I would absolutely buy this again.

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.