Product review (5 stars): Great Product
My dryer vent is long and vents through the roof.  The roof vent outlet is like an upside down "J" which means the only practical way to clean the vent is from the inside.  Due to the length of the vent I also purchased an extension kit (4 more 3' rods). I have a small (2.5 Gal.) Shop Vac with a 1 1/2" hose.  I used a pvc coupler and a lot of tape to adapt the small hose to the LintEater Vacuum Adapter.  It worked great and the hose did not get clogged.  The Vacuum Adapter came with a  2 1/2" to 1 7/8" reducer which made things a little easier. Too bad they don't also include a 2 1/2" to 1 1/2" reducer even though they don't recommend using a hose that small.  The 2 1/2 gallon Shop Vac got filled up each time I added another rod (lots of lint).  I had to use 7 rods (21') to reach all the way to the roof vent outlet.  Even at that length it worked fine.  Hard to believe how much lint was removed.  The Operator's Manual is easy to read and follow.  This product works as advertised and is well worth the cost.