It seems like it works as intended. The air quality reading on the app has been decreasing fairly steadily. I vacuumed the room to test it, and, as I assumed, the reading spiked from the vacuum kicking up dust particles etc. One critique would be to make the app a tad more user friendly and straightforward. Good product though.
I love it that it has phone features and makes ot easier to turn it on and to check everything simply on my phone. I highly recommend and should get one