Product review (1 stars): Junk!
Recently got this unit. Right out from the box, the sensor for the air filter had become unglued. Fixed it by using a small piece of double sided  3M tape. One draw back I noticed was each time when unit is unplugged and plugged ,, the filter indicators for smoke filter and the vacuum filter had to be reset. A hassle! As far as the functionality it does no more than what a charcoal heating coil/burner does but at a much higher price tag. The starter function did do much . So in my opinion it is not a worth the bucks. Save your bucks and buy a charcoal heating coil/burner.
***Update-Stopped working on the 2nd day. The vender directed me to the manufacturer. I was given their rep's cell phone number which turned out to be a wrong number.***