The Blueair Blue Pure 511 is a filter that works great! When they say it is quiet boy do they mean it! I have it always powered on my high setting because I have a dog, (and am super allergic to the dander) and I have to walk over to it and make sure it is on because it is so quite. It actually works as well, I was a skeptic at first, but I don't have to dust as much any more and my house actually smells cleaner as well. I highly recommend this one. It is super cute too, and goes with the decorations. its not just a black fan in the corner.