Product review (4 stars): Works but easily damaged
I can't rate a five only because I won't get more than one use from this cleaner.  It worked as described and I can't believe the amount of trapped lint I removed.  What a fire hazard i was living with.  The reason this is not a five is the electric drill twisted the ends to near breaking point.  If I were to use this again i surely would lose the brush somewhere in the duct.
My suggestion is to set your drill sensitivity to a screw driver setting rather than on the drill setting.  At least this way you will not over torque the plastic rods.