Works great!
Not much to rate here.  It either works or doesn't.  Mine works great.  I guess if I had one complaint, it would be nice if I can pump one time and get a decent amount.  I need to pump 3 times to get just enough to swish around.  And for those with big mouths, you would probably need 5 or 6 pumps.  Good exercise.  Be careful though, the pump has some power and it might splash out and leave marks on the wall/mirror behind it.
Rating: 5 stars