I have a logitech op myself, and I wont buy a ball ever either. But ball-mose devices have their uses: If you've got kiddies, buy a ball mouse. My pal's kid let his op-mouse fall off the desk. Mouse had to be replaced. Ball mouse devices offer a robustness that might be preferable in certain situations.
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"Failing tastes of bile and dog vomit. Pity any man that gets used to that taste."
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