I use this diffuser regularly and it does work and runs a long time. This is what I like. I have to leave it on a water proof counter due to it condensing all over the diffuser and the surface it is on. When I put it on low it does not seem to do this but if I forget to put it on the lower setting it will condense all over the surface so I can't trust to put it on any furniture or the furniture will be ruined. I have to put it on the counter in my washroom which of course has a mirror next to it. The diffuser even on low setting it leaves a fine white powder on the mirror, the surface the diffuser is on as well as the diffuser itself. You are then not able to use the mirror because it becomes foggy. So the diffuser actually makes a mess of my house.