I have used my IBUKI for 4 months. My dad has lung disease, and it seems to have helped him breathe easier. You can tell it is working when looking at the filter.
I have had this a year now. We do noticed the difference in our bedroom as that is where it is but when we upgraded to the Ibuki+ I noticed that the app was showing me on the new one that the air wasn't as clean as it could of been. But it was better than it was. My biggest beef is it goes through filters FAST. That indicator goes off in less than 3 months time I think it is about half. And I take the filter out and it looks clean, so I don't get it. Be nice if they could turn the lights on it off for night time.