Breville microwaves often target premium countertop setups, but the repair decision should still be conservative because microwaves contain high-voltage components and many service calls approach replacement cost. With an expected life around 10 years per Consumer Reports' summary of manufacturer expectations, repairs under the threshold can be reasonable when the failure is a door switch, fan, or an external control issue and the unit is not old.
Replacement becomes more attractive if the unit stops heating (often magnetron/high-voltage circuitry), repeatedly blows fuses, or shows arcing or burn marks, because repairs can be costly and safety-sensitive. Consider the usage pattern: frequent high-power operation and poor ventilation can accelerate wear.
If the microwave is integrated into a built-in cabinet setup, installation labor may affect the economics, but the same threshold logic applies. The replacement price used reflects a mainstream countertop microwave benchmark from a major retailer; many Breville models cost more, so treat the threshold as a strict repair cap.