I have a 1200-watt microwave oven that my sister gave to me years ago.
You'd think this would be better than the typical 800-watt oven, but it has a drawback: If you're following a recipe for an 800-watt oven and you reduce the cooking time, there's less time to distribute the heat, so you end up with parts severely over or undercooked. You have to reduce the power, but the next step down is 600 watts, and then you end up with a *slower* cooking time than usual.