I use PS/2 era model M's on all three of my desktop computers. I used to pick them up for $1/per at various swap meets. I ruined a couple of them after cleaning

I use PS/2 era model M's on all three of my desktop computers. I used to pick them up for $1/per at various swap meets. I ruined a couple of them after cleaning the switch deck in warm water, after several successful experiences with the others. To date, I haven't found anything I like better, though I haven't tried any of the modern mechanicals.