Product review (2 stars): Not sure it's reducing dust . . .
Maybe I should try my Air-o-Swiss 7135 without the cartridge, because I still get plenty of dust.  I'd like to see how much I get *without* the filter.

For me it was no problem using the refill packs as opposed to the new cartridge.  Just dump out the old and dump in the new with the extra parts included.  Definitely worth the savings.