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Think about it for a second.  The cone plus the medipure filter will certainly filter to HEPA levels before the air enters the motor. However, the carbon brush particles coming off the motor (which is harmless) is still seen as a 'particle' by the counter. As the FQ has only a foam batting filter after the motor, the particle count will be high. One must remember that the carbon particles aren't actually 'dirt' and harm no one. The particle counter is a great tool in the hands of a Miele dealer - but that doesn't make the counter any more 'meaningful' than any other 'testing gauge' (like a water lift guage).