 good because you don't see you don't have to deal with it not to worry about it not that it's ugly it's actually a nice looking unit but it's not this gigantic thing that's got to be in the middle of the living room you're going to trip over the cords and everything else it's out of the way and it does a a humongous job it goes out and looks for viruses odors mold and a lot more that's floating around in the air and takes care of it that odor that you can't find it'll find it sends out o3 molecules that will go behind and under furniture and seek out and destroy