Calibrating 5.2 SMs

Does calibrating 5.2 SMs help with signal and efficiency, harm things, or just not make a difference? What has your experience been?

As far as I know, all calibrating does is give you proper RSSI readouts(is there such a thing?). You need to calibrate if your RSSI is showing up red.

Thank you! Just wanted to make sure there were no weird side-effects of calibration.