I like the machine a lot. It is quiet, makes a good amount of mist (keep a towel down to keep floor dry), and holds enough water to last several days. I had a hard time getting it to work at first, until I discovered that it had an opening in the back and it was pushed up against the wall covering it up. Pulled it out and it worked fine.
It came with some flat, funny things that may be a filter of some sort. I still don't know what they are as the book does not mention them. All in all, I think it is a good buy and easy to use, warm or cold or with a therapy oil.