Product review (5 stars): A simple solution to a big problem
I am so glad I bought this device.  After about 20 minutes of use, which included assembly and experimentation, I had succeeded in pulling out an ugly glob of wet, compacted lint from my dryer vent pipe.  That huge pile of yuck on the ground represented about 13 years of accumulation.  It also represented a fire hazard and drain on my electrical bill.  So, I'm glad I bought this device.  My vent pipe was about 20 feet or so long so I had to get some additional rods to make up the difference.  It is easy to assemble, the process being screwing fiber glass rods together.  [Think they're fiber glass].  Then attach a brush to one end and a drill to the other.  It's normal to be concerned about the rods disconnecting so I covered each joint with  electrical tape.  Actually, no realistic chance of a joint unscrewing unless you reverse your drill.  And I judge the rods to be unbreakable.  Then insert the brush and joints into the vent pipe until you encounter resistence.  Then activate your drill in a clockwise fashion and exert gentle pressure forward.  Periodically, pull the glob out until you're all the way through.  My vent was previously blowing an almost indiscernible wisp of air through the vent when the dryer was on.  Now it's a nice, solid, warm breeze as nothing stands in the way.  Clothes dry in FAR less time.  Even though the device is intuitive and easy to assemble and use, there are clearly written instructions that also give some advice on dryer connections.  And if you were to disconnect or break a rod inside the vent, the company has a toll-free number for a device to fix that.  [I suspect it is a magnetized rod].  Anyway, now that I'm unclogged, I plan to use the device periodically for PM to prevent this problem in the future.