When you set your microwave to, let's say, 20% power, a typical microwave will cycle the magnetron, so that it runs at 100% power for 20% of the cooking time and is off in between. With an inverter, the actual power output of the magnetron can vary, so it's actual 20% power for the whole time. It does an excellent job of gently reheating things like sandwiches and cooked rice without drying them out or scorching. Also, if something has instructions written for a lower wattage microwave, I can just turn the power down until it's close to that wattage instead of doing calculations to modify the time.