Less-expensive microwaves often have very similar performance to more expensive models, although their manufacturers may make compromises on build quality that many users find unacceptable. However, less-expensive microwaves are often more energy efficient.
Many expensive microwave ovens include features such as convection cooking, but do not have improved performance as microwaves compared to more expensive options. Pricier microwaves may be designed as over-the-counter or built-in models, which are often more costly despite having no real performance benefit over cheaper counter-top models. Finally, microwaves with 800 watts of power or less are thought to be more energy-efficient than models with large power draws.