We bought this unit only a few days ago so I can't really say how well it cleans the air, however it is very impressively constructed and I expect that it will work as described. Given that the "cleanliness of air" is subjective (unless you suffer severe allergies which was not our reason for purchasing) and hard to evaluate I am writing the review for others who might want to know how well it's put together. It is quite "handsome", designed not to be intrusive and easy to move around. The unit is whisper quiet, even on high setting is only makes a slight masking noise, it is extremely easy to use and comes "plug and play". The body is very well made and when lifting it (not heavy) you can feel that it is very well made. The oscillator (an option on other models) can be turned on or off. If you don't need it for allergies, I might recommend waiting to buy until warmer weather arrives as it does cool the room as it purifies, fine for Florida....not so great for New England in winter.