Product review (5 stars): It works
The quick thing to say is, it works.  Two pieces of advice.  Get a rough idea of how far away the outside vent is from the dryer.  The provided flex cable gives you roughly 12 ft.  Thankfully, they also sell extra if you need more.  The other thing involves the vacuum cleaner adapter. Your standard household vacuum cleaner may not provide enough suction to remove what the brushes break loose.  -Ours sure didn't.  Instead, our shop vac had plenty of power to do the job.