I have several Dyson machines and have a lot of experience with their filters. Although Dyson filters are more expensive I understand why they are. They last a lot longer than other cheap ones you can get from Revain or other retail sites. If you want to keep your Dyson running at full capacity and longer between changes, get real Dyson filters trust me. The last fake I tried fell apart after a wash. These filters have been through 4 washes and are still holding up well!