Product review (5 stars): Worked great
Used on a vertical dryer vent and was amazed at how much came out.  Used both the tool to clean the clogs and the regular brush for the vertical vent.  Used separately again with the flexible hose to connect the dryer to the vertical vent within the wall and was amazed at how much lint it was able to remove and how easy the tool was to use.  Very easy to use and very pleased with results - have added a picture of the results from the first pass through the vent to show how much lint came out.  Saved me from going to the store for a new dryer ;)