I have looked for the best air purifier for my house for months. Every web site "review" I looked at was either biased or totally different styles and line then the other sites. So I took it upon myself to figure out which purifier would give me clean air without an empty pocket. When you combine cost of filters, warranty, com stoner satisfaction, and features all together, the Allen breathe smart will win every time. My family owns several other brands and mine puts there's to shame. I am sure if you are still reading this you are probably saying " which employee of Allen's is weighting this but I truly am not. I was so happy I have three purifiers all Allen's in my home. Now I am looking to put one in my office.