I’m very happy with my purchase- after two months. I even bought a second one only weeks after buying the first. Breathing the purified air reminds me of the air at the lake house- it’s like the difference between tap water and filtered water. To those who don’t appreciate clear air or water, they might claim there’s not much difference; but, to the rest of us, including my wife and me, the difference is clear and appreciated. Even my young kids enjoy standing over the purifier breathing in the fresh air!