I got this product for free to test out from a campaign and it turns out its very good. My room is not too big but I really feel the difference in the air after having this air purifier in my room. I have a fan and before having the air purifier, it collected a lot of dust and is visible on the fan, but after using the air purifier for a while, I noticed the different right away. There is less dust on the fan and I don't have to clean the fan that often anymore.