Product review (5 stars): Very Simplistic but does a great job!
Being the Clark Howard of West Georgia, I am always looking at ways to save some money and put to better use of wasted energy.  This little device does a fantastic job of both.  Note that this will only work with an electric dryer.  Also this works best with houses that use heat pumps for heat instead of natural gas or other fossil fuels. During the winter, using the heat pump all the time tends to dry out the air excessively. I got some extra extension hose and pumped the hot air and moisture into my main living room.  Using this I was able to get my humidity level to a more acceptable level (40%-50%) as opposed to being in the 30% range.  This saved energy by not having to run a humidifier.  Also, this raised the temperature in my living room several degrees when the dryer was going and my heat pump did not run during this time.  For best results, I would use hot water to fill up to the line and have the discharge of hot air/moisture go into a large room.  For a small room the humidity may be too much.  This does an excellent job for collecting all the lint that comes out.