Product review (5 stars): Great Product - Excellent Results
I purchased this set with the extra 12-foot extension package.  I followed the instructions exactly regarding the clutch settings on my cordless drill, securing each rod joint with electrical tape as each rod was added, and using proper motion during the cleaning action.  I also used the option of connecting the Shop-vac to the dryer end, using the vacuum adapter with 2-1/2 inch hose; and inserted the cleaning brush from the outside, allowing the cleaning brush to self-feed toward the vacuum cleaner. I found the instructions to be complete and well written.  I completed cleaning the dryer ducts in two homes, both with 20+ feet of duct. This this system worked exceptionally well. When completed, the Shop-vac was opened up at each location for cleaning, and  was nearly packed full of lint on both occasions.  When I inspected the ductwork, it was very clean. This was the most useful equipment purchase I've made in a long time; and the quality appears to be very good. There was no mess to clean up when finished, and there was a noticeable reduction in drying time, particularly with heavy fabrics such as jeans.