Got this for dry winter.  Our hygrometer was showing very low humidity in our house, and this has helped immensely.  The two tanks on the sides are easy to fill and the operation is simple.  The first several days we were wondering what sound we were hearing in the house, and realized as the water level dropped, it would go chug chug chug as water would leave the tank to go to the bottom to be wicked up.  Once we knew that this was the source, it didn't bother us at all.  We refill about every day and a half.