Product review (5 stars): Perfect!
Worked exactly as described, very clear and thorough directions. My dryer blew a thermal fuse and after making sure the heating element wasn't shorting out I noticed there was no airflow coming out the vent on the outside. This tool went through two  90* bends very easily and dislodged a large piece of plastic that somehow found its way into the piping (the tool pushed it back through the two 90 bends). I got a grocery bag full of lint out of a 10' section of pipe, with that and the plastic gone there is way more airflow and the new thermal fuse has not popped.