I'm not entirely sure what all the fuss is about. These things have been in use as directional cooling blowers for ages. We've got a few of them scattered about here at work.
The only difference I can see with Dyson's gadget is that, rather than run it from air supplied from a remote compressor, as we do, he's packaged a mini-compressor into the unit.
They are quite good at moving air, though they're not exactly 'silent'. The ones we have make quite a 'whooshing' sound when they're turned on.
For $300, I'm not sure I'd be queueing up to buy one.
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