We have 2 stationary bikes in an attic room that doesn't have windows that open or very good ventilation. It gets really smelly in there when we both are riding our bikes. This really helps with the odors and air quality, which I can see what the level is on the app. It's quiet and compact and like that I can use Google home voice control to turn it on while I'm riding the bike. I also like that it tells you when to change the filter as I never remember to do that.