I read a lot of great reviews of this product, and I honestly haven't noticed a big change in my rooms air quality. When walking back in from the outdoors I don't notice any difference in the air freshness. Aside from that, the machine is very quiet- however after several days of use my purifier started to make a low whining noise. I may have to contact customer service.
The only time you hear it running is when it is on high and the only time it's on high is when the air quality is bad. I have two cats and when they scratch themselves you can see fine hair come off of them. The air purifier clears the air pretty fast. I'm very happy with this purchase.
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