I saw the Ozonics piece on "Ground Zero" this spring. I bought an HR-100 at the Minnesota Deer Classic. On my first night out I had 4 bucks around my stand. I wasn't winded during the entire encounter. I'm a believer. In fact, I have not been blown at all season.
The only downside I can see is that the unit itself is heavy. It's like carrying a brick with you. I have some long treks into some of my sets, so it is a bit of a chore. I haul it in though. I don't like hunting without it.