Bests & Worsts Reviews from Amazon

I got the unit, it seemed to work when I first got it, and after a while, I started displaying an indoor air quality that was perfect (0 PM2.5). I didn't pay attention to it too closely until we got some nearby fires and the air quality was actually 300+ (i.e. terrible and hazardous to breathe), but the unit still showed 0, perfect air. Tech support suggested cleaning the sensors, and once we established that the unit was indeed malfunctioning, because I only realized it wasn't working after the warranty was over, IQAir told me they wouldn't do anything to fix or replace it. So, it's a bad and unreliable product with a company that will not stand behind it. Shame, because it was otherwise beautiful with a nice interface, but that's worthless if it fails at the one job it has. The picture shows air quality from the internet and unit showing indoor pm2.5 of 0! You had one job.....