A good air purifier is very important to me since I am an allergy sufferer but even if I was not, breathing clean air, is essential to good health.  This unit is easy to set up and can cover a room up to 1200 square feet.  It runs quietly and can auto-adjust power to constantly maintain clean air.  I personally feel this unit has made a difference in my overall health this spring and would recommend the Shark to anybody searching for or looking to upgrade an air purifier.