Purchased for use in a smaller room (12x12) with wood floors. Ran on high for 3 hours and then have had running on low since. Much cleaner air and visibly less dust. Reasonably quiet on low. Haven't had long enough to know how long each filter lasts but so far so good.
Don’t buy it. There are no replacement filters available. It’s only as good as the 6 weeks the filter is good for. No replacements available anywhere