Product review (5 stars): A clean vent pipe makes a happy dryer!
I've got this super long dryer vent that runs from the middle of my house in the crawl space out to the side.  It's probably about fifteen feet long.  I bought this tool along with the extension kit and was able to clean out my monster dryer pipe in a few minutes.  I'd recommend taking it a bit slow the first time, but there really isn't much to this considering the value of being able to get the lint out of the dryer vent.  This makes the job almost, dare I say, fun.