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I wouldn't really say Dyson has perfected cyclonic dirt separation, there still is working room. They don't even have the best filtration using the design, The 11 amp Fantom Thunder does the best job by far of dry multi cyclonic separation, probably followed by a well maintained DC07. I think if Dyson had enough airflow rough some of the designs they could do a fantastic job of filtering. I'm fairly convinced you need large airflow through the Cyclones to get good separation.