These filters are effective, allowing you to use your B&D vacuum for almost any small mess. They are easy to install. The only drawback is the difficult cleaning. You can use them for a long time if you need to clean them. If you only have one, this can be impractical. Proper cleaning means taking it apart (very easy, no screws) and removing the parts from the ribs of the filter. Then you wash it in warm soapy water and let it dry. It can take 24-36 hours, which is a penalty for missing two.