Product review (4 stars): Works very well.
Works excellent. I used to packages joined together to clean out a 20+ foot dryer exhaust run. The only complaint I have is that it is difficult to unscrew the poles once they are screwed together. I basically had to use the drill in reverse to get them to unscrew. In truth for the few times a year I will use this to clean my dryer it is not a big deal.

Following the instructions of another poster after I used this brush to clean out / loosen up all of the dust I attached my leaf blower to the vent (inside the house) and blew everything outside. The combination really did the trick.