Product review (5 stars): Did a great job!!!!
This product was all that it claimed to be and preformed very well.  I helped my brother-in-law clean out about a 35' dryer vent run (including a 45 bend) that was severely impacted with lint.  We first used the lint eater tool and got all main clogs out then used the brush.  Using the shop-vac attachment we were able to suck an entire trash bag full of lint out - no exaggeration, he's lucky he did not have a house fire on his hands.  By the way, the quote that a company gave him to do this was $250-$300.  We spent about 2 hours being thorough and now his vent is flowing like new.  The only comment I have that could be an improvement or simply a manufacturing error is that the brush itself attaches with threads and has a set screw hole ~ it worked very  well but the set screw hole did not have threads so we tightened it with pliers and it was fine and can not use the set screw.  The bad news is now I have four other family members requesting to do their vents too ~ anything for family, right!  This product is very worthy of a 5 star rating!!!!