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Title: Do not trust reviews
Review: I wanted to replace my failed Microsoft trackball optical which had served me very well for many years. As the Microsoft trackball optical was no longer available I trawled Amazon for similar devices, after extensive research and the reviews posted I decided to go for the Kensington Expert Mouse ModelK64325, I wish I had not. It is an ergonomic disaster, no button falls easy to hand, making a smooth workflow impossible. The scroll ring quality is well below standard and the trackball unnecessarily large and heavy. The number of programmable options was nowhere near that of the Microsoft unit which enabled one of its five buttons to be programmed as a "back" button, this I found very useful. Modern plastic packaging does not make it easy to repack and return, if it did this mouse would have gone straight back.
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