Product review (5 stars): Highly recommend
I was skeptical at first but this little kit did the job perfectly.  I had hired a guy 3 years ago and he charged me $250 to do pretty much the same thing.  It took me about an hour to unhook our dryer and complete the entire run.  Our dryer sits about 30 feet from an outside wall in our home.  It also runs vertical in one spot and accumulates lint on a regular basis.  I purchased the 12 foot extension kit and then ran it from the inside and then finished on the outside.  One pointer which I found out on accident.  Once I finished inside I hooked up the dryer and turned it on while I finished running the rotary snake from the outside.  This helped blow out the lint as I worked.  It was real messy and I suggest wearing eye protection.  I spent more time cleaning with my shop vac than actually using the tool.