I was perhaps a bit shocked how physically BIG this unit is but it's stylish and I no longer notice it. What I do notice is CLEAN AIR. We have a lot of allergy problems in my household and the Alen BreathSmart 75i seems to be doing an excellent job of removing particles, odors and pet dander from the house. You can actually watch it work. The status light tells you the quality of the air. When somebody goes in or out of the house or something fragrant is cooking, the status typically changes to lower quality and the "auto" setting kicks the fan up higher. If it isn't working fast enough for you, you can manually turn the fan up to high speed and the air is typically clean in minutes. And it's QUIET. We don't even notice it, most of the time.