Has appeared in comments, but deserves its own thread: the MX510 Logitech mouse. Mine is approaching a decade old; still functions perfectly. : r/BuyItForLife
Logitech G5 Laser Mouse: When an update is not worthy of a new name
Am I crazy to think the basic Logitech / Microsoft mouse has the best shape?
A 14 Year Old Mouse That's STILL Amazing! Logitech MX510 - YouTube
Amazon.com: Logitech G500 Programmable Gaming Mouse : Video Games
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