I can't say enough about this.  It humidifies an 800sf main level and a 400sf loft bedroom fully.  It's quiet-ish even at full speed and very quiet at low speed (use once up to desired humidity level).  The large dual-reservoir system is great because we only have to refill once every day or two.  It's not stylish like some other ones, but as a result it blends in a bit more and simply works.