What are the disadvantages of using a solar cooker ? Are there places where solar cookers would have limited utility ?

Explanation

Advantage : Solar cooker uses solar energy to heat and cook food. It is inexhaustible, clean and renewable source of energy. It is available in unlimited amount for free. Therefore, operating a solar cooker is not expensive.
Disadvantage : Manufacturing cost of a solar cooker is very high. It works only in sunlight. If there is no sunlight then it will not work. Hence, on cloudy day, it becomes useless.
Solar cookers may have less applicable in places where days are shorter than nights, that is places towards the North and South poles. Also in winters, when the length of the days is short, these cookers might have limited application.