Product review (5 stars): Works well - especially with drill adapter.
Bought this device a few months back and finally got around to using it (my wife made me).  We have flexible aluminum venting attached to our dryer running about 8 feet in length.  It was a long way from being plugged, but the dust bunnies were a tad bigger than I thought they would be.  Mostly, I wanted to clean it to reduce the potential fire hazard.  There was definitely enough lint in the vent to create a fire that would move all the way through the vent.

We have those louvered vinyl vents outside that refuse to come off, so running the auger brush from the outside was not possible.  It wouldn't fit through the louvers.  The long brush would fit through the louvers but it wouldn't make the 90 degree turn down to the basement.  So, we just disconnected the vent from both ends and laid it out on the floor.  We hooked the shop vac up to the adapter and twisted the auger brush through by hand several times while suctioning.  That didn't cut it in that a lot of lint was left inside.  I used the provided drill adapter and ran it in and out twice with my cordless drill.  Big difference.  That hummer was pretty dang clean and the filter on our shop vac was completely covered with lint.

We vacuumed out the vent at the back of the dryer.  I then used the long brush by hand and shoved it in and out of the lint trap while running the shop vac.  The brush went in quite a distance and pulled out some good size wads of lint.  Obviously, the lint trap doesn't "trap" very well.  Some caution is in order when doing this.  I had to keep twisting the flexible rod clockwise while working in the lint trap.  The brush kept trying to work itself loose, and I didn't feel like disassembling the dryer to get the brush out.

Several minutes later (along with some mumbled cursing), I got the vent reattached and we were good to go.  Glad I bought this device.