Even after sanding/polishing/buffing the button parts, I still don't like the button very much. Best button so far that I've tried is still the Paps button. I prefer a button inside a ring, as opposed to the whole bottom being a button.. makes the action a lot smoother.
There is hope for the china nemi switch. All three of mine are pleasing to use now and I'm a switch snob. The only thing I can't fix is excessive switch play. Polishing the post, shimming magnets and shimming for 0.5 mm to 1 mm throw really helps. On my loose wobbly switch I have magnets shimmed for firm actuation w/ a 0.5 mm throw and the wobble is ignorable. I don't notice the clicky edge press problems anymore; don't know if pinky is trained or switches broke in.