I love innovation when I see one. And this type of fan, although not new, just recently caught my attention. Does anyone use it? I have a few questions to those who do:

1. The designers boast that it's easy to clean, at least on the outside and along the cylindrical shroud. But they fail to mention that in theory, the impeller inside will eventually accumulate enough dirt to affect airflow. How easy is it to clean that?
2. Is it noisy? In the few Youtube videos I've seen, the fan appears to emit a loud whine, somewhat akin to a CPU fan at high speed. I plan to use this in the living room and/or bedroom.
3. Going green and all that, how about efficiency? Watt for Watt, is it better or worse than a conventional fan?
4. Reliability?

Some features I like:
1. It is obviously bladeless (at least, none are exposed), so it's safe with toddlers around. (Though, the fan itself might NOT be, but that's different :D )
2. Continuously-variable speed. At least on the models I've seen, it has a knob like a light dimmer, instead of buttons with fixed speeds
3. It looks cool; Jetsons-cool! Both literally and figuratively. It will blend very well with any modern household. It can also be a nice ice breaker for some guests who's wondering how the airflow is generated

Anyway, for the clueless, this is what I'm talking about: YouTube - ‪Sir James Dyson explains his bladeless fan‬‏