Product review (5 stars): Works Like Magic!
I could not have asked for a better product.  The vent was so clogged with lint and airflow so restricted that the dryer was overheating and shutting down.  This thing pulled enough lint from my 25' of venting to half fill a white, kitchen trash bag.  I was astounded by the amount of lint this thing pulled out.

Very easy to use, it worked its way through six corners with ease.  I took about 40 minutes to finish, including cleaning from both directions.  The only small complaint I have is that the shopvac adapter is big, bigger than most household vacuum hoses and the hose of my smaller shopvac.  A bit of duct tape quickly remedied the mismatch, though.

I can't remember the last time I was this satisfied with a product that does exactly what it claims to do.