I've owned it for several years. The thing is unusual, but interesting. Most of the effect can be obtained if there is not enough space for the mouse. The trackball is much more convenient than the touchpad of laptops! It should be noted that using such a thing is very unusual, therefore - at first it will be much slower than a mouse (but comparable to the touchpad of most laptops). But - much more mobile wrist. But we must take into account that at the same time the hand hangs over the ball without support and gets tired faster. Therefore, if you are considering a tool to combat tunnel syndrome, but at the same time actively use a manipulator, a vertical mouse is worth considering.
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