 Good, because you don't see it and you don't have to deal with it or 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 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. It sends out O3 molecules that will go behind and under furniture and seek out and destroy those nasty smells throughout the house.