I ran it overnight with the O3 setting on medium (had my bedroom door closed) after a day of not only cigars but cooking a steak in a cast iron skillet and the fireplace, there was a marked difference in the morning, granted you can smell that 'hydrogen peroxide' smell but it's a clean smell compared to all the smoke from the night before.
I like that you can run the 03 and Purification separate, that being you can run it just for dust and pollutants in the air without cranking up the 03.
So far so good and for the price (saving 50%) it's hard to complain, I'd say it pasted the first test with flying colors.
Of course the caution below, so some of you probably should operate at your own risk
