Product review (5 stars): Great product, works as advertised.
Works great, turn on you dryer to "no heat," go outside to you vent, place the brush in attached to a cordless screwdriver and go away, the amount of lint that came out of the vent cap was unbelievable.  It had only been 2 years since I last cleaned it but what a difference.  The volume of air coming out after I cleaned the vent dramatically increased as well, it now takes less time for the dryer to dry a load.  Definitely recommend.