Product review (4 stars): It works, but be careful!
So...This works.  If you follow instructions and are careful you will get all that built up lint out of your duct. BE WARNED,  THOUGH.  Once attached to the drill DO NOT reverse it at all. It will unscrew the connecter rods and the whole thing  will come apart INSIDE YOUR DUCT AND YOU WON'T BE ABLE TO GET IT OUT YOURSELF.  hahaha.  I know this because that is what my husband did and now we have to pay to have someone come to our house and fish it out for us. :p