Product review (5 stars): LintEater Worth It's Weight In...
...Silver at least, maybe gold!  After burning up two dryer elements (under warranty, thankfully), the technician recommended cleaning our dryer pipe that runs through the concrete the length of our garage.  A chimney sweep quoted $100 to clean this pipe and I happened upon the LintEater on Amazon.  I purchased with the extension kit.
I didn't read instruction, except to make sure there was no special attachment to connect rod to drill.  The rod fits directly into drill once you open chuck all the way.  Of course, by nature, I began attaching all the rods together, but once started, realized that I should attach one rod, run it through pipe, disconnect from drill, connect the next rod, and so on (the instructions probably said this much).  It only took 15 minutes to run the LintEater through twice (I thought I did it too fast the first time) and the pipe is definitely clean.
It's well designed and I would highly recommend the LintEater.

Side Note: Most of the lint was in the bottom of the down pipe, before pipe turns to go length of garage.  That lint came out when I was just trying out the first rod and ran it down and pulled it out.  The LintEater grabbed the lint and brought it up when I brought it out.