I bought a pack of ten for my Roomba 680. I installed one and had it cleaned. It hit the spot. I see no difference between the original filter and this one. After cleaning the Roomba, I always clean the filter and brushes. I have three cats and I want it to clean as well as possible. I use a can of air to blow out the white dust that collects on this filter. I like the cost of the filter, you get a good amount for your money. I will be buying more to have on hand and I think they are worth recommending to anyone who needs them. It's not often that you get something cheap at a good price, but this is one of them. If they change in the future I will come back and change my estimate.