This has been a wonderful addition to our home since spring allergy-season has arrived!  My oldest has been getting awful allergies and we've been using this in his room prior to bed to help him rest a little easier.  It quickly gets things out of the air so it is 100% by bedtime and he is ready to go.  It is small enough that it is easily moved from room to room but also covers a wide space if you keep it in a main living area.  We can easily move it to his bedroom and back to the living room during the day.  We will be getting another for multi-floor living so we don't have to move it but it isn't a hassle.  On the lowest setting it is very quiet.  The higher settings can be loud but not obnoxious.  It sounds more like white noise at the higher levels.  I highly recommend!