The BEST. 5 star reviews. Awesome purifier. Looks so cool you'll love it. So quiet. Ideal for allergens, odors, dust, smoke... Only used for 3 months. Recommended to change the True HEPA charcoal filters after 5 years so... lots left on those. Auto modes for times of day and whenever it detects pollution particles. Just don't use it anymore. Don't need it. Someone out there does!