For me it was Logitech that forever changed my mousing experience somewhere in early 2000. Their Logitech Optical USB mouse (this one: https://www.amazon.co.uk/

For me it was Logitech that forever changed my mousing experience somewhere in early 2000. Their Logitech Optical USB mouse (this one: https://www.amazon.co.uk/Original-Logitech-Optical-Mouse-Buttons/dp/B00S6CHX9U https://www.amazon.co.uk/Original-Logitech-Optical-Mouse-But...) was the first optical mouse on the market here. It was outrageously expensive for my teenager budget, but with a USB-to-PS/2 adapter and some Windows utility to tweak the OS refresh rate it gave me a real advantage in Unreal Tournament. No more gunk messing up accuracy. I used it for years and if I’d still have it, I don’t doubt that it would still work.