It's barely ok
As an owner of Kensington Orbit, when I decided to get myself a portable trackball this was an obvious choice, since it is basically Orbit's smaller portable copy. Turned out it is not nearly as good as Orbit is. The touch ring for scroll is a very bad replacement for original mechanical one, it is curved, but your natural instinct is to drag your finger in a line, and with this thing you have to intentionally curve it. Second - the ball itself is small, and unlike on Orbit it is being held by rotating balls. In theory it should make it more smooth, in reality I don't feel the difference, but they tend to fall off and easy to just lose. Where this trackball shines is on buttons - they both are mechanical and very comfortable, and when compared to Orbit they are a lot better. However, the shape of it is very questionable, where Orbit and other trackballs have a smooth slope this one has a steep one with a bump. This shape is very uncomfortable, and to me it causes hand strain pretty fast. But it gets worse - the shape only makes the small ball worse, since there is a lot of extra surface around the ball, and your hand don't lie on the ball, it rests on all this extra surface.
So to me this trackball is a disaster, and a very good example how after making a great Orbit Kensington can fail miserably on Orbit Wireless.
Apart from buttons - the build quality is pretty decent, and the pads on the bottom are good at keeping trackball from moving. It's just the design where this fails so badly.
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