Benefit:

1. Avoid the temperature drift.
   
2. Auto z_offset Calibrate From the data bellow we can see that the temperature drift will only change the z_offset, rise or low the bed mesh, but does not change the bed mesh with this BDsensor. that means the bed mesh is the same even with different temperature.
   

3. Repeatability: +/-0.005mm

Nozzle Collision Sensing with eddy BDsensor (pandapi3d.com)

Let me feel confidence with the first print layer, Real time leveling ! (pandapi3d.com)

My bed needs 900 bed mesh points, but it's quick to do 900 bed mesh points with BDsensor.

Delta printer Fast Bed Mesh with BDsensor for Marlin firmware.

 No need to modify the klipper source code with latest code on githube for BD sensor.

https://github.com/markniu/Bed_Distance_sensor

after one week work there's a progress, fast bed mesh for klipper with BDsensor, 300mm/s , klipper source code: https://github.com/markniu/klipper

Here is the beta version of Klipper that support Bed Distance Sensor

https://github.com/markniu/Bed_Distance_sensor/wiki/Installing-for-Klipper