The size/shape of this product is nice, as it can be put in a corner and not feel as if it is taking up a large amount of space. It is not too loud or annoying. Even on the highest setting it just sounds like a fan is running. We live in a log home and wanted to be sure we had fresh, clean air circulating in our home - that could be prone to mold, mildew, etc. We feel protected with the PureZone Elite 4-in-1 running in our main room.
                    The only thing I wish the products had is a light that indicates current air quality level so you could really see it in action.