I would like to get a Power Factor (PF) value for my devices (especially the big loads) to better understand whether the device is operating efficiently. As Sense would log this over time it could also be an indicator of preventative maintenance of the load.
*Extra points: break down the PF into displacement (fundamental) PF and harmonic PF.
Unbalance Load Factor
Having a balanced Distribution panel (draw approximately the same current on each leg) is important to the electrical company (affects their transformer I believe) and if you are on a demand power billing schedule that also gets affected.
This is a good read on the subject: