Okay I haven't used them extensively so I'm reserving a star. We replaced the filters and these new filters seem to work just as well as the standard Dyson filters in our pet hair vacuum. I think it's a DC 69. I noticed that the larger round filter didn't "snap" into the car like a normal one. Did Dyson have more tension? I don't know the reason for this, but it seems to be firmly attached when installed. All I can say at this point is that they fit and seem to work. I will leave the last star when I see how long they last and clean well. The Dysons have a bad habit of "whistling" when they get dirty and with 14 cats (yes that's 14. hey we adopted!) which amounts to a lot of fur/dirt and various things, the cats carry around. I want them to work, so we'll see. To stay updated!