Works pretty well
I bought this to help with the terrible dryness I was getting in my lungs. I live in a desert and developed a terrible cough from the drying effect of the oxygen. This helps significantly with that. It's now more humidified than just breathing regular air. The only problem is that the line can get water in it and make gurgling noises. I've mostly taken care of that by clearing out the line right after I turn it on. I use it when I sleep, so I don't know if it gurgles during the night.
Rating: 4 stars