Product review (5 stars): Excellent product.
Our vent runs up into the attic and we don't have a pull down staircase to climb up.  So, before we bought this rotary dryer vent cleaning system, we had to get a ladder and climb up into the attic to be sure we were doing an adequate job.  We would tie a bunch of plastic bags to the middle of a long bit of cord.  One person would be in the attic and would drop an end of the cord down through the vent.  When it reached the bottom, the other person would pull the cord until the knotted plastic bags came through, along with lots of lint.  Then the person in the attic would pull the cord until the plastic bags came through on their end, along with more lint.  This would continue back and forth until we felt sure most of the lint had been removed, which was very time consuming.  Furthermore, for us, climbing up a flimsy ladder into a hot attic is dangerous business.  So we bought this Rotary Dryer Vent Cleaning System.  All we had to do was assemble the vent cleaning unit (very easy), pull out the dryer and detach the vent, then run the unit up through the vent with the drill slowly turning.  It was easy to determine when the brush exited the far end of the vent as there would suddenly be less resistance.  Once the unit has reached the far end of the vent, just pull it back through with the drill still slowly turning.  This dryer vent cleaning system removes far more lint from the vent than the plastic bag method ever did.  It only takes us about about five minutes.  We clean our vents with the rotary dryer vent cleaning system several times a year.  I feel safer now knowing that a potential fire hazard is well taken care of without putting our lives in further danger by climbing an unsafe ladder into a hot attic.