I had read it was recommended to limit the first 10 flights to 10 minutes each to condition the battery. Between the rain and incessant wind, I haven't gotten those flight in yet to develope my own concerns. So even just having just one battery hasn't been much of a concern.
However, rumors say - the "disconnected" issue is big, the out of level horizon is a pain, too warm, hot, motors and batteries after flights is causing people to get infrared thermometers to check temperatures, best time for IMU calibration is after leaving craft and battery out in the cold and calibrating immediately after turning craft on on a perfectly level surface, calibrate gimbal immediately after that, this method of cold calibration also helps speed up the seemly long preflight warm up times of several long minutes, there was a comment of the craft forgetting settings after being turned off and back on, no dynamic home point, no HDMI output from the controller (not yet, but soon will get it). Didn't check post counts, so most of these are probably just rumors or trolling.