Did a lot of research, settled on this air purifier. Noticed a HUGE difference on the FIRST day. I've had mine for about a year, and really really like them. I had never owned an air purifier before and thought it might even be a scam to "clean" the air. I was wrong. Once I pulled out the filter and see the gray air it sucked in, I was hooked. I bought more than 1, because we have a ton of allergy sufferers in our house. Highly recommended.
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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