I purchased this product because I did not have adequate space for a conventional mouse. This trackball has all the additional buttons (programmable) to use for tasks such as back, forward, close app, switch app, etc. The ball is moved by the middle finger (or close to it), not the thumb, which takes some getting used to. Clicking and dragging is probably the hardest thing to do based on button positioning.
The alternative is a thumb type wheel. The problem is the thumb type trackballs do not have the additional programmable buttons. To date, no major complaints aside from the 'training' period necessary to learn the movement of the trackball.Get more detail about Logitech Cordless Optical Trackman (USB/PS/2).
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