Product review (5 stars): It Save Me $200.
The device works very well. By cleaning the dryer duct work myself, it saved me $200 by not hiring a professional.
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The product is very simple. Attach the soft brush to one of the flexible two-foot rods. Insert it into the dryer vent. Attach the end of the rod to a variable speed drill. Set it to forward and slowly press the trigger.
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The slow rotation and pushing the rod forward and back sweeps the lint inside the duct work. Attach another rod and repeat the motions. Keep on doing this until the brush is pushed to the other end of the vent.
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If the duct work is too long - over 12 feet, perform the above procedure from the other end. Mathematically, this will sweep 24 feet of four-inch tubing.
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ONE WORD OF CAUTION, DO NOT SET THE ELECTRIC DRILL ON REVERSE. This will unscrew the attached rods inside the duct work. The only way to get them out is to dismantle the four-inch tubing, saw into the sheet metal, and pull the rods out one by one.