I brought one with me to the Boundary Waters the first weekend in June.

In short, it works.

I'm a native Minnesotan and grew up with the skeeters. I don't like using any repellant and am of the sort who avoids it until I can't stand it any longer.

Weather that weekend was cooler than normal - highs barely touched 70, so the bugs weren't out that much to begin with. Though others in my party were constantly spraying the deet on. Had I not had the device with me, I don't think they (the bugs) were bad enough for me to use any deet.

The thing doesn't work well when you're moving around or in a breeze. But when it's still and you're sitting by the fire or in the hammock, it definitely works.

Takes about 10 minutes or so to kick in (build up a cloud of the insivible stuff around you). The fan makes a somewhat annoying whine, but I got used to it.

Not sure about health effects. There is no noticible odor.

Knowing what I know, and how I am about using deet, I would def. buy this again. Great alternative (situational) IMHO.