One hassle with a mini split can be noise during the heating seasons.
The std hassle with a reverse cycle air con. is when the outside temps go below 40F or so , air conditioning the planet (to steal heat) stops when frost covers the heat transfer fins .
The mini splits solve this shut down problem , by reversing the units operation for a min or so, reverting to an air cond to use that heat to clear the fins.
To make up the heat taken from the interior the units run at full bore for another min or two, then revert to almost silent operation.
Depending where and how the outside unit was mounted can decide if you ever hear the unit functioning during the heat season..