Product review (4 stars): I liked it, because my dryer vent goes up to ...
I liked it, because my dryer vent goes up to the roof and out instead of horizontal and out thru the wall. I did it myself, but it's better if two people do it.  I was able to extend the brush up the pipe about 15 feet to the top.  I was able to collect about 2.5 gallons of lint.  The dry works alot  better now.