Product review (5 stars): Better than expected - watch the you tube video
I was amazed at how easy this was to use and how well it worked.  I saw a you tube video of how to use it which was super helpful.  You will need a shop vac to make this work but it is SO worth it.  Our vent was in far worse shape than we thought.  Now we can dry clothes in one cycle again!  This saved us from buying another dryer.
Not sure if links are allowed here but here is the you tube video: [...]