Product review (5 stars): The right tool for the job
Bought this along with the 12 ft extension and it worked very well. I was able to remove about a 4 qt basket of lint from a 20 ft long dryer exhaust pipe in a few minutes. The mess was very well contained. I had no problem with the few corners (45 degree).
Then I used it on my brothers place and a rental property. Kept on doing a good job.
I used an endoscope to check the results and the pipes were very clean.
It sure beats paying $100+ for a pro to do the job, and I can repeat the work if needed in a year or two.