My roommate recently purchased one f these things from Sharper image for $300. He had it running on high in his bedroom. Any time he would open his door, I could smell ozone, and a lot of it. About a week later, he starts feeling pretty crappy. I do some research, turns out these things can put out a toxic level of ozone. Consumer reports bashed the things for the same reason, and the EPA even put out a huge report on how dangerous they are. Crazy.
anyway, just thought it was interesting there was no warning on the thing to warn of the possible dangers.