Refresh may be on the RC, but I've not seen many if any posts on the RC going bad. Should the drone crash or be lost - DJI only replaces the drone.
I'd not carry both and SF may or may not cancel. Have a buddy who has it and claimed a couple of drones and did not cancel.
The cost of Refresh+ for the
M3 is crazy high, so no way to carry it and SF for that drone.
I had Refresh on my Mini and they did not cover my crash - my error. I paid $300 for a new Mini and extra for the battery that was on the drone at crash. Had Refresh on my
Air2, but let it lapse after a year. Will go with SF or some other insurance co for coverage. I checked with USAA, my home / car insurance and they don't cover drones at all.