I have been using my Levoit Classic 300S Smart Ultrasonic Humidifier for around 10 days now and have to say so far so good. It keeps the air from being so dry which is a big plus and it turns out there are so many nifty features included in this machine that I havent really had a chance to try them all quite yet. The ones I have tried I really like tho such as the night light, the voice controls and the bluetoothing. It comes in great for controlling your environment at home while you are away. I havent encountered any downsides yet so I would definitely recommend this product. Its easy to use and works great!