Nice looking air purifier. Easy to use. Light enough to move it around the house. Makes high-pith noise that is only audible to two of the younger family members, and wrote to the manufacturer about this but no response. Have used for a couple of weeks but not yet noticed any significant change to the allergy, even though after keeping it at max in a bedroom of the allergy sufferer for a few hours each day, turning it off at night because of the high-pitched sound that's apparently unpleasant. Hopefully we'll notice changes in long-term.