Great unit, for the money. I have asthma, and it gets much worse from being indoors too much (e.g during winter). After an hour of running the purifier, my asthma symptoms began to improve. If I feel an asthma attack coming on, I immediately go to my bedroom and turn the unit on to ‘turbo’ mode for 30 mins. It definitely helps. Now, just gotta hope there’s no bushfires this summer . Fingers crosssed.