It seems to be working. I haven't had as bad allergy attacks in awhile and there seems to be less dust around my desk. The filter seems to have caught a lot as I can see it in there. I just took the filter out to make sure and yes, there has been lots of dust caught. It is quiet and have had no issues from it. I like that it is USB as that made it easier to find someplace to plut it into for me.