I have other ionic air cleaners, as well as one that requires a filter. This air purifier is quiet and due to its compact size, can be placed off the floor on a bookcase, dresser top or top shelf which makes it optimal for space-saving and placement. I don't particularly like the noise from air filters and they have a tendency to keep me up.

After spending many dollars on replacement filters and new air cleaners when the filter is no longer made or easily available, this is a welcome addition with a permanent cleanable filter. I bought two of these, one for my bedroom and one for the living room. Set on low all of the time, it is great as it just sounds like a little white noise and is not noticable most of the time. The optional ionic on and off switch, night light, as well as the automated light indicating that the filter should be cleaned is a BONUS besides the low price. So far, I am enjoying cleaner air in an old dusty house with 3 cats and 2 dogs...

I have bought the Sharper Image ionic breeze for the bathroom and find it hard to clean and hope that when I have to clean this filter. Good value for the money.

I brought this one recently to replace the sharper image's ionizer purifier, since I want something to shut off the ionizer -- the air has some smell from those ions.

This unit has three speeds. Another switch to turn on or off the ionizer.

The lowest speed can push enough air comparable to Sharper Image's high speed, without much noise. If no one talks in the room, you can still notice the sound. But if anyone talks or the TV is on, then you would not noticed the sound, even in a 8x10 room. Middle and high speed push 20-50 times more air than a Sharper Images ionizer purifiers. I wish it has a feature to push a button to boost the air flow to high speed for 15 minutes, then fall back to slowest speed...

For the price of a tank of gasoline, and free shipping from Amazon, buying this is no brainer....

I might buy a second one for my home office. As another reviewer mentoned, it is a little noisey on high, but the second setting (which seems powerful enough for my needs) has a pleasant hum that acts as white noice. It has a nice stable design...because it sets square and low, my cats haven't been tempted to try to push it over (some air purifiers looks a little too much like cat scratching posts). Instructions on how to use and clean are easy to follow. I'm not sure what the ionizer is supposed to do so I haven't used that feature, but so far I seem to be sleeping better with it running than I was without it, so I am assuming it is doing ts job. No complaints so far.