Haven't talked about Hall effect and debounce since my paintball days. The cool thing about these actuations is you can actually use a second magnet in the key for the resistance. Two ways to do that: either pushing two like magnets together or pulling two opposite magnets apart. The first method is similar to a spring ( resistance increases the farther you push ), the other reverses it. Also since magnetism follows the inverse square law, the resistive force changes drastically after a few millimeters, while a spring is almost linear.
Ahhh, I still remember the magnetic trigger on my old E-Mag. It used the attractive method with two magnets holding the trigger forward. I used some extra magnets to stiffen it up against accidental firing. Trigger broke at about 2 lbs. Once it broke, the resistance fell to almost zero. Smoothest trigger I ever had. I'd like to see what a keyboard with the same actuation would feel like.
But I too prefer a little tactile feedback on my keystrokes, so I'd like to see some kind of "bump" incorporated into these.