Wonderful!
If anyone is looking for a white noise device, don't bother with the electronic/digital options.  Like others have said, I too get annoyed when the digital track loops, causing a hiccup in playback.  Since this is mechanical, you have a steady, natural sound that will drown out most noise.  I can't hear my wife talking to me in the hallway when this is on!  Helps my 6 month old sleep so well, we are buying another for my 3 year old, to help her sleep too.  Can't go wrong with this!
Rating: 5 stars