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This type of mouse - which you do not need white paper or can use on glass or uneven surface - is the only way to go. I also use this for my tablet/laptop. To make the ball even smoother and more responsive, I spayed contact cleaner on the ball metal bearings and it works better.
Verified purchase: Yes | Condition: Pre-owned
The ring and the trackball move very smoothly even after months of heavy use and the optical sensor is accurate and durable. But the whole mouse is small enough to fit mostly in the palm of my hand. While the trackball can be removed for cleaning, the scroll ring cannot. The ball is too small which limits it's range of motion. The buttons are aren't positioned or shaped comfortably. The driver software can be configured to create a third virtual button when you click both physical buttons at once but it's not compatible with many game and office applications and it hogs the CPU. After only a few weeks of light to moderate use, or a few days of heavy use, the buttons will begin to automatically double-click on occasion. This becomes more severe over time until the buttons become unresponsive. It's assembled with very tiny screws that require an uncommon star-shaped screwdriver which makes DIY maintenance impossible. The three rubber pads on the bottom are glued on. The glue easily absorbs oil and becomes soft, causing the pads to come off. $30 is affordable but a bit steep for such a toy.Read full review
Verified purchase: Yes | Condition: New
With one exception, these things are great. After using it enough to get accustomed to it, it's so much better and easier to use that I'll never go back to an ordinary mouse or touch pad. The exception is the button switches that wear out after about a year of all-day, every-day use. They eventually get to a point where they may double-click when not intended, or have to be pushed multiple times, or very hard, to work at all. My second one is about to this point, and I'll probably order a third today. I've looked for something else that does the same thing, and might be longer lasting, and there is nothing with the same combination of features other than the larger Kensington trackballs, but they're too big to carry around in a bag to use with a laptop, and cost two or three times as much. If you use it constantly (which most people probably don't), you'll have to buy one every year or so, but it's worth it.Read full review
Verified purchase: No
My only gripe is that the buttons are placed back and require me to move my thumb and pinks back 1/2" to click them...it is difficult and not natural to double click with my thumb which is much harder to get used to at this angle. I think the cheapo Logitech Marble may have a better grasp of this with the position of the click keys. Still, the logitech does not have the handy scroll wheel which i love.
Verified purchase: Yes | Condition: Pre-owned
This trackball is what I have been missing for years and did not realize this until now. A hand held mouse does not have the speed, comfort and accuracy of a trackball. Why I hesitated in the purchase of a trackball is that many did not have a page scroll control which, for my use, is essential. This one does using the ring controller - well designed and is a pleasure to use. I will be swapping out my other mouse units for a Kensington Scroll Ring Mouse. Cons: The extension pad which is packaged separately, that attaches to the mouse body to give your arm / wrist support, is not at all well designed to attach to the mouse, The tooling out design of the pad does not snugly fit onto the mouse body. It needs to clamp or snap onto the body so that it stays in place. This is why the 4 stars. I removed the ball and lightly added a Teflon dry lub to the ball - this stuff is smooth and the weight of the ball adds an inertia component needed for a quality action. Read full review
Verified purchase: Yes | Condition: New
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