Product review (5 stars): Awesome!
This works great just as advertised.  I used this along with the 12-foot extension kit to clean my dryer vent.  My dryer is on the first floor and the vent goes up through the house and out of the roof on top of the second floor and this unit had no problem at all cleaning out 12 years work of lint, dirt, and other materials.  A local guy quoted $130 to do the job.