Yes indeed* - I still use and prefer those to this day: I like the extra weight and slight inertia that comes from the rolling ball. (It's OK, I know I'm a din

Yes indeed* - I still use and prefer those to this day: I like the extra weight and slight inertia that comes from the rolling ball. (It's OK, I know I'm a dinosaur!) (* They're more correctly called opto-mechanical since the movement sensing is done by way of a slotted disc interrupting light beams.)