I do not believe that in normal use, the Dyson Cinetic will leak dust into the motor. Mine has been used at my home for two months now, as the only vacuum, and there is absolutely no dust leaking into the motor. The first time I saw the video where the kid claimed to have found all that dust, I realized the machine had been tampered with. It states on the cleaner not to use it on drywall dust, and clearly this kid did just that (or talc maybe).