I'm so happy with my air purifier. It covers a lot of ground for the cost. I have rescued rats  (they don't exactly smell like roses) and this filters out any unpleasant odors. I also used to sneeze often and I don't anymore. So my place smells great, I can breathe and my ratties are happy! I made sure to shop around before making the purchase. Also to make sure that the filters are available to buy and at a reasonable price. The machine is very quiet. I leave it on manual and it changes air flow speed automatically depending on air quality. It's functions are easy and I truly recommend this product. I hope this helps anyone and have a wonderful day!