I was doubtful but it actually does make the air in the room cleaner. It feels fresh without having to open a windows. Pair this with a gunfire in the room when your sick and you'll feel better in no time.
Our house is very dusty, it was built in 1837. Even though we have ducts cleaned regularly and change furnace filters every 4-6 months, there is still a lot of dust more so in winter. Have purchased an air purifier for several rooms and it makes a big difference. The filters last a good long time if cleaned regularly and they are very affordable.
I really like this air purifier. I keep it in my daughters bedroom and run continuously as we have a cat. It is very quiet on lowest setting but i prefer the medium setting. The filters last a long time and hold up well. My daughters preschool uses these as well in each classroom.