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 like my Dylos thought it would, and it actually reduces the amount of dust particles in my room. Also, unlike cheap all-in-one filters, this one has a metal mesh over the filter paper so you can easily remove large lint that has been picked up by the vacuum cleaner. This is a very well made filter that is worth the extra cost. I understand the temptation to use the cheaper imitation filters that I've been tinkering with for a long time, but be aware that they don't filter out fine dust particles like the original Neato filter.