Product review (4 stars): Solution to elongated drying times.
This has definitely reduced our drying time.  When we first moved in, we thought maybe the vent was clogged so payed someone to clean it.  Things got marginally better, but still not great.  We finally stumbled on this product which has pretty much solved the problem.  The dryer vent run is probably 20 feet, but has a few twists and turns.  It seemed like it was in spec for the dryer, but I guess in spec vs actually drying your clothes in a timely manner are two different things.  The device was relatively easy to install, I wish it had a slightly smaller form factor, but simply pulling the dryer 6 or so inches from the wall seems to provide enough space for the device plus the dryer hoses.  The automatic on/off works flawlessly and so far the unit has performed quite well.