Product review (5 stars): Works as expected, efficient use of time, and easy to use.
Used it a twice.  Made cleaning the dryer ven a breeze especially because it attaches to the drill.  I have a short dryer vent using at most 2 of the extensions.  I was surprised at the amount of lint that was removed.  It gives a visual piece of mind that the vent is clean and will keep air flowing.  Works as expected, efficient use of time, and easy to use.