I've had this Instant™ Air Purifier in small size for about a week and I am very pleased with it. I have it set up in my son's bedroom not only to improve the air quality in his room, but also because he has a cat. This air purifier is great because of the filtration system and plasma ion technology. The hepa-13 filter is amazing too because it capture 99.97% of dust, allergen, dander, pollen and other allergen. Perfect for us because pollen is bad here in the south and we have pets! I like that it senses how bad the air quality is in the room and it changes color and automatically fixes the air quality. It definitely gives me a peace of mind that my son is breathing better air especially that he is immune compromised. I highly recommend this product.