Product review (5 stars): Helps a lot.
I have used these for 3 winters.  They make a bid difference.  I have to fill them up every morning and every evening whenever the heater is running a lot.  It only takes a minute to do it though so I don't mind.  The difference it makes in the house was astonishing.  No more getting shocked from static electricity all winter long!

We were going through a new electric humidifier every other year due to the hard water.  I save money with these because I am no longer spending that money on expensive new humidifiers and I am not using any extra electricity.  They are much simpler to fill than the electric ones, which I also had to fill daily.