Product review (5 stars): Works exactly as advertised
I rarely take the time to write product reviews, but this handy device was so great that I decided I had to leave some feedback.  The design is simple, but clever. It is neatly packaged and includes everything needed to thoroughly clean a dryer duct up to about 12 feet long.  I have to admit I didn't read the instructions other than the little yellow warning note inside the package about NOT using the drill in reverse.  If you do this, apparently the rods come apart and will be lost inside your dryer duct.  In spite of not reading the instructions, I experienced no problems and was able to clean my 12 foot duct in under 5 minutes.  The amount of lint that was removed was astounding, and airflow through the duct is noticeably better.

Overall a great product at a very reasonable price.  Highly recommended!