I bought this a month ago for our large bedroom. It's remarkably quiet and just happily runs in the background and you can barely notice it. We have multiple dogs, and my wife and I noticed a much better quality of sleep and reduction in allergens in our bedroom. No more waking up with "gunk" in our sinuses. This is a situation where you get what you pay for, and it's definitely worthwhile. We're considering getting another one for our family room based on the noticeable air quality change.