Product review (2 stars): So So
I'm not a fan of these.  The furnace came with an aluminum coated pad.  They are hard to find in stores.  I tried these for a while and seemed to work.  I added a second zone in my house and the new system is strong and the pad sags when wet and is forced out of tray.  One night I went into basement to find water on the floor because that humidifier was slightly opened because the pad was not seated correctly.  I found the metal pads on a different website and they are holding strong with the new system.