An excellent purchase! I highly recommend it. I purchased PureZone air purifier because of the benefits I shall get from it, as I have a very bad allergy especially from pollen, and it did not disappoint me. I also purchased it because of the high ratings received from other purchasers. They did not lie because I, too, gives PureZone a 5 Star rating. Btw, when I first used it, I had the speed in low for sometime, yet I still could feel the fresh air coming from it. Even the medium speed is soft in sound. I am so glad I bought it -- so glad. Thanks, PureZone.