I've had this air purifier for a couple weeks now and so far it's been great. My favorite feature has to be the visual representation of your air quality. There is a number and color scale that will change as your air quality gets better/worse (higher numbers and red/orange colors means poorer quality while lower numbers with green/blue indicate better quality). The purifier also has a "smart" mode where it will operate at a lower power consumption rate when the air quality is good, saving on energy spend. I have yet to use the smart features as I'm always at home nowadays so I can't speak to those. All in all this thing is awesome.