What a marvellous idea. The reviews were mixed, but I decided to give it a go. I tend to suffer from colds developing into a chest infection and wanted to try something to clear my sinus' and prevent this from happening. I found this really helpful in clearing my nasal passages and therefore, aiding sleep and getting rid of my cold. I added nearly boiling water to a few drops of olbas oil and only half filled the cup, you learn that you need to turn the lid around so that the air hole is not under your chin, as the steam will come through it and burn you, although this is common sense I did not manage it the first time! I have since purchased one for my parents, who also thought it was fabulous. So much more comfortable than placing your head over a bowl of boiling water with a towel over your head. The steam is concentrated to the nose and mouth, so it prevents the steam and any additives to it from stinging your eyes or making you perspire. I would highly recommend this fantastic, yet simple idea.