No friction at all really. I was careful to only tighten down the lock nut till just snug enough to hold the props in place. So far, so good.
Calibration is done as far as making sure all my controls are proper, esc's in sync and all that goodness.
I got if off the ground and into a hover, but my yard is quite small, so I need to head out to a park close by to really get in some flight time.