I have looked into getting an air purifier for quite some time and when I found Blueair and read all of their reviews I knew it was what I was looking for.  Sure enough I ordered enough for every room in the house and I'm so glad I did.  We have cats and dogs and have noticed a significant difference in the air and how clean it seems.  The only down side is it really isn't good at completely clearing out smells in the house but it significantly reduces them.  Deficiently worth every penny.  Breathing healthier air for sure now.