Product review (5 stars): Must-Have for Homeowners
I purchased this kit and a 12' extension kit to clean the 21' from my dryer in the middle of my house to the outside vent. I had been avoiding using it, but the first day of fall begged for a project so yesterday I finally did it.  The results were as expected. The dryer vent system is now clean and the airflow from the dryer to the outside is at least 50% better.

Some tips to using this product:

 Watch a couple of YouTube videos for 'LintEater' before you start.  It will give you a visual that the written directions just cannot.
 Read the written directions and then re-read them. You may have to make adjustments to the setup you use based upon your particular dryer and vent system.
 Use a leaf blower on the highest setting before you use the LintEater.  Blow from the pipe opening nearest the dryer to the outside by sticking the leaf blower inside the pipe and turning it on.  You'll be amazed by how much stuff flies out of the vent even before you use the LintEater product. Sort of a 'pre-clean' if you will.
 Gather the tools you'll need first.  For me that included a Phillips head screwdriver (to release the hose clamps on the dryer and vent pipe), leaf blower, two wrenches (to twist the two ends of the LintEater sticks together tightly), duct tape, a flashlight, and a shop vac.  Eye protection and a mask or bandana to cover your nose and mouth is also a good idea.
 Use small strips of duct tape around the connections between the sections of the LintEater. This will help prevent it from coming apart IN the pipe.
 Use your power drill on the lowest setting and go slowly, gently working it down the length of the pipe with short back n' forth motions.
 Always have your drill turning clockwise.  NEVER reverse it go to counterclockwise - even when pulling it out of the pipe.  This could cause the sections to come undone inside the pipe.
 Blow out the pipe with the leaf blower after using the LintEater to get fine particles out.
 When you are done, attach a clean dryer vent hose from your dryer to the outlet. Use your dryer's 'air' setting for a few minutes to continue to dislodge debris.

NOTE: This product could also be used for the gutter downspout on your home.

Overall, I'm very pleased with this product. If used properly it has the potential to be used for several years without the need for replacement. The product is high quality and easy to use.  Definitely a must-buy for home owners to prevent dryer fires.