The BreatheSmart 75i Air Purifier is the second unit that I purchased within the past few months. I owned the 45i which we put in our Master Bedroom. The difference both have made in the air quality is unbelievable. We have pets who shed and it has made a tremendous difference in the amount of hair floating around and on the floors. The air smells so clean, which I'm sure it is compared to without the purifiers. We placed the 75i in our open family room/kitchen area. I definitely recommend and would purchase again.