Automatic air quality sensor works very well and is not just a gimmick like on some other brands - it detects both latent air particles (dust) and has a sensor for gaseous pollution as well (fumes, etc). Unit IS actually almost completely silent in...

There was a noticeable but not overwhelming smell from the unit for the first 12 hours of operation. A small con that would not prevent purchase again, but something of note so you can be prepared for it (I was aware of this from review on another...