This is the first air purifier I’ve ever bought and I was definitely skeptical. We had new flooring put in and dust was everywhere in our house. I vacuumed and mopped and still I could smell the dust. So, I put my skepticism aside and bought the Alen BreatheFlex Air Purifier. Literally within hours I could tell the difference! The air in my home is so much fresher and cleaner than even before the new flooring was put in!