i've heard of them but i just figgured it was cheaper to hire a snow clearing service.
one might think it would get bogged up with too much snow... but then again - if it worked on the driveway and sidewalk to the house might be a great idea.
all depends on heating costs too though if it's economically viable but if the house is geothermal heat and it's fed though that might not be a bad idea and would be cheap to do as well 
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This dog, is dog, a dog, good dog, way dog, to dog, keep dog, an dog, idiot dog, busy dog, for dog, 20 dog, seconds dog!
Now read without the word dog.
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