Product review (4 stars): Overall a good product that will pay itself back in heating
The price is low and it blows out the hot air.  Don't leave it venting inside at all times.  If your drying clothes close it for the first 5 to 10 minutes then let it vent inside.  This will prevent a large amount of moisture from venting inside.  I have mine venting into my garage in the winter so it puts some moisture inside.  I made the mistake of leaving it open after three cycles of drying clothes and it put out too much moisture.  It does blow a little bit of lint out.  I clean the mesh screen before I vent it into the garage.  Overall a good product that will pay itself back in heating.