You know, I have no use for optical switches on a practical level, none of my boards use them, but boy do they come up with some unique stuff sometimes. These ROG RX optical are surprisingly smooth. They might be made by Omron, at least that's what I'm going with due to their similarity to Logitech's Romer G switches. Watch out for the plastic lens in the middle, it can fall out if you aren't careful. The red one is linear of course.
