I needed a backup filter and this set was the best price I could find. The filter is easy to insert, but very difficult to remove for cleaning. When it finally comes out of the case, my fingertips hurt and I'm surprised I didn't break it. I've been using it for about a month and take it off every day. "PacMan" (my robot vacuum cleaner) sucks. It didn't get any easier to remove. Other filters fit well and I like the extra brushes.