Excellent filter effectiveness, one knows that everything remains in the vacuum cleaner. Note the filter is not washable !!! So from time to time to buy a new please. In our Cyclone XL filter fits exactly and not only filters fine dust of partly by the Bagless system. Can certainly not be held back, but also the coal dust caused by the brush when engine. At the end of life of the filter is of very black inside and above still beautiful white (= clean air comes out)