'I'm very happy with this diffuser! I'd used another brand before but this is better. I add lavender, peppermint, teatree essential oil to relieve allergy and put myself into a good sleep - 4 hrs is enough! I've been using it each night for 2 weeks now and so far so good! Other good things: 1. Auto shut off - the transformer at the outlet doesn't heat up (some appliances if you don't have the machine on but plugged in, the transformer still heats up) 2. The diffuser starts producing mist as soon as it's on. I had another one before and no mist came out for a while. 3. It can be used as a night light although I find it too bright as I'm sensitive to light and can't sleep so I put on eye mask. If using in the home office/living room the lights are awesome.