I received this unit as a gift and am extremely disappointed with its performance, especially given its price point. Mist: There is no noticeable difference between the high and low settings; neither one produce a significant amount of mist. Aroma: I have been adding 15 drops and the aroma is beautiful for an hour or two, and then it disappears. I have never had that issue with my AromaOm. Noise: Every time I turn it on, there is a loud whirring noise. It eventually dies down, but it's safe to say that this unit doesn't run quietly. It's ok if you enjoy a bit of white noise, but it drives my boyfriend bananas. To conclude, I would not purchase this unit again, nor would I recommend it. Save some money and buy the AromaOm.