draw backs are you need a south facing hill to build your house in and even then you are stuck with windows only on one side of the house, if you use sky lights then you have the cost of those and the draw back of sky lights (moister problems, leaks, high heat loss), If you can keep the water out, fresh air in, let light in and find a location that has a hill facing the right direction then yes, they are great, really, it's part of choosing a good site for your house.
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