I love this air purifier.  As a smoker and pet owner, this is just what I needed!  The timer is great.  I click on the timer as I leave in the morning, then it turns off during the day.  After only a few days of use, I see a very noticeable difference in the air quality of my home.  I've also noticed less dust on furniture, and less cooking odors.  Can't wait for Spring, so it can clear the pollen from my home.  It's quiet, so it won't interfere with music, TV, conversations.  The cord is long enough to plug it in and still move it away from the wall/furniture.  No filters to keep replacing - just vacuum the HEPA filter and put it back in.  I would highly recommend this to everyone.