Product review (5 stars): Just buy it!
This thing works GREAT!  I have a 3 story townhouse with the laundry on the third floor venting through the attic and out to the roof. Im not permitted to go on the roof, but I was able to go into the attic and disconnect the vent from up there. The amount of lint that this little tool pulled out was just ridiculous!  It spun great on my cordless drill and in just under an hour, my dryer vent which clearly had never been cleaned ( I recently bought the townhouse), was clean as a whistle!  Very little effort and MUCH less expensive than calling a vent cleaning company.  WELL worth the $30!!!!