Product review (4 stars): Does what it's intended.
Definitely helped raise the humidity in our house this winter. Our furnace sits in a closet with a louvered door open to the laundry room. When we ran this open with the dryer, we just switched the furnace blower ON to send it throughout the house. A digital hygrometer showed it raise the humidity one day from 16% to 45% with 2 loads of laundry. Worked perfectly. Made the house much more comfortable during dry winter.

Only reason I gave it 4 stars is you can't rely on the screen cover it comes with...it doesn't catch anything. A panty hose leg worked perfectly, just not so tasteful :P