Perfect!
This is exactly what I've been looking for.  I've had it a couple weeks and it's great.  The ones with nature sounds, etc. have too much sound pattern in them that starts driving me nuts in a short time of being on.  This machine has a steady sound that's sort of like when I run my window fan in summer.  Since I've been using this machine I haven't been woken up once by the neighbors downstairs (who are talking and laughing at all hours of the night and were waking me up).  I don't even have it right next to my head, I keep it across the room.  I don't really feel the need for a volume control, since it does vary a bit when you turn the casing, top and bottom.  It's really amazing because I don't think it is extremely loud but works to drown out the noise downstairs, or maybe it conditions my mind not to hear it or something....anyway I'm extremely happy with it and I'm a very sensitive person.
Rating: 5 stars