I've seen a lot of people knock replacement bags for one reason or another. Poor fitment, poor filtering, etc. These work well - it fit nicely and seemed to feel like it was made well. I can't swear it filters better than any other bag, and I know that 3rd party bags can be quite a bit less, but it's not a huge amount of money - and for all the vacuuming I do (one dog plus one cat = daily vacuuming) I'd like to think the bag is not shooting out a lot of dust - I'd buy these again.