These filters are obviously a lot more expensive than regular fakes, but they're worth it. I have tried various imitations and although they fit, they are poorly made. In addition, conventional filters do NOT filter out fine particles. With my Dylos particle sizer, I can see the indoor dust go from 300 to over 5000 when using the total filter! It filters only the largest dust particles. This Neato Ultra brand has nothing like it. When I use the Neato Ultra, it filters out fine dust particles…