In an earlier contribution to this discussion,
Andrew Gabriel wrote:


In theory, cyclone cleaners should be clear winners. The extracted
dust is removed from the air path whereas with a bag/cloth filter,
it is clearly trapped directly in the air path. What has held
cyclones back is that they work best when they are dustbin sized
and upwards. Getting one to work in something the size of a portable
domestic vacuum cleaner is a challenge, although Dyson seem to have
largely mastered it.


By all accounts, Dyson can make them *work* - but not work *reliably*!
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Cheers,
Set Square
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