The oled display is nice, but I rarely care in realtime what the exact metrics are. I have that stored as time series stats sso I can see trends over time. Exactly like I do for metrics of production systems in SRE life.
The unit also has a series of LEDs across the top and I can read the actual status from 20’ away (which is as far as I can get without going out a window or around a corner).
One green led? Good. Two green leds? Meh. Three LEDs? They’re red now and that’s not great
Single red led in the top left in addition to any on the right? Spectrum is having yet another outage (no internet)
No LEDs? Not powered on
Reviewer was overly severe and did his readers a disservice.
It’s better imho than my Airthings wave pro, and it lets me get awesome, actionable time series data. It’s sensitive enough to show air quality taking a dive overnight with two people and multiple pets breathing in the same room (one green during the day, three or four red at night), and also to show that adding a half dozen spider plants keeps co2 well in check (consistent one green led).
And I can read the air quality from across the room without getting out of bed.