There are several reasons I like this fan. It sits on top of the stove and moves the hot air right from the source. It uses the heat of the stove to work, so doesn't cost anything to run. Also it only works when the stove is putting out some heat; when the stove cools down, it stops.
The first one I saw had a price tag of $180 and I thought it was a neat idea, but not $180 neat. This one was a hundred bucks less.