I could see another advantage for residential use -- you should be able to make the failure mode for this style safer, because you are already wrapping the turb

I could see another advantage for residential use -- you should be able to make the failure mode for this style safer, because you are already wrapping the turbine in metal. It should also be easy to close the channel and stop wind from getting to the blades which is also not possible with traditional designs. But yeah, I'm leaning with the other comments in this thread that these guys sound too shifty in the way they're promoting this, and it makes me suspicious of the utility of the product.