@John_Ridley you converted me. I’m now buying hall endstops for my new Delta 
Are they a drop-in replacement to regular switches, or are firmware changes needed ? Can you link to your vendor ? Thanks.
@John_Ridley dunno where you got the idea that mechanical switches had terrible repeatability: https://www.youtube.com/watch?v=5l7UMoEBP6g
They provide amazing repeatability.
@John_Ridley My labs Lulzbot AO-101 goes everywhere with lots of different members, tossed in trunks, etc. We haven’t had to adjust the Z axis (mechanical) endstop in months. (Ever since I told everyone to stop “leveling” the bed)