Product review (5 stars): Well worth the money.
Bought this after my wife complained clothes were taking 2 hours to dry and I could barely feel air coming out the exhaust vent. We had been fighting drying problems with our high efficiency dryer since we bought it. When I was hooking things up I noticed that there was easily 1 inch of lint build-up around the outside vent. Used a shop vac on one end and pushed the auger brush through the line with a cordless drill, the floppy rods easily make the bends. The line looked like new and my wife says the dryer is finally working like she hoped it would. High efficiency dryers work by pushing more air through the clothes, this results in more lint and I now know that I should be cleaning the exhaust line yearly.