If you think that the "fan" don't need to clean unlike the blade type, think again. The "fan" works by taking in air from the bottom unit and push out from the gap in the ring. So on the long run, the place where it takes in air will get larger partical stuck and then dust will stick to those partical and you might feel less air flow as time goes by. You might need to place a filter around it and reduce chance of such things happen. But by doing so, you will also has lesser air flow as air needs to pass throught the filter which is a resistance or the machine will have to work harder to get over the restriction. The selling concept of this new product is pratically because it is bladeless and cool looking compared to conventional fan.
About drying your hair by placing your head close to the middle of the ring, there is no air flow in the middle of the ring. I have 100% convinced that air is taken from the bottom unit and pumped into the gap AROUND THE RING by moving my hand around the test unit in the shop during window shopping.