I've no experience with one but you have my interest now.

Last time I researched these types of device I came up with spilt results on them being harmful due to ozone emissions. Some studies say yes some say no, usually depended on distance from device when measured. Most studies concluded they didn't do much so it wasn't worth possible risks. There was a big "feud" between consumer reports and the manufacturers/retailers a few years back.

Hmm, yea I read some places about the ozone. I wonder if I let it run while not in the car that would work?

I have a midsize car with cloth seats. I don't smoke in there but the smell still lingers I guess from my clothes. I just need something for light duty. 

I own an ozone machine - mainly for the semi-annual bomb of the smoke room, eradicating my built in and cabinet humidors, and the occasional clearing of odors in our vehicles... works great.