Product review (4 stars): Worked Great
This cleaned out my dryer vent from the roof down, the Wet Dry Vaccum I had at the bottom sucked up a bunch of lint.  It works great for the price, and you will be able to use it again and again. Peace of mind that you will not burn up your dryer or your house down.
I bought the extra extensions because 12 feet was not long enough from the top of the house.  Great product.