Product review (5 stars): Keeps the outside air out
I had a traditional style dryer vent that allowed cold winter wind to blow into my laundry room.  During the winter, the room would drop 10 to 15 degrees without fail.  Since changing to this style vent, my laundry room stays warm.  It works as advertised and keeps the outside air out.  Also, I have not had any problems with lint build-up in this vent.  It was fairly easy to install and only took 20-30 minutes.  I am completely satisfied.