Product review (5 stars): Worked great and saved me a ton of money
We were the second owners of our home and soon after we moved in, I started noticing our brand new dryer was taking a lot longer to dry clothes and the air in the room had a lot of lint particles.  Upon doing a bit of research, I narrowed down the issues to the dryer vents being clogged.  I called some of the vent cleaning services and the quotes were mind boggling.  Based on the length of the vent, they started at $100 to a whopping $400.  I think the companies prey on your fear of dryer vent fires and charge accordingly.
The vent was located in our basement ceiling and ran the entire width of the room around 25 feet long.  I just disconnected the vent at 2 locations and fed the brush from 1 end and collected the lint at the other end.  In this way I was able to clean it from 2 locations to complete the entire length of 10 years of gunk.  I just taped the vent back with 3M Silver tape and viola it was done in about 2 hours.
The key is to make sure to follow the instructions carefully and use the lowest setting on the drill to turn the cleaner slowly.  Instructions were concise and worked great with my cordless Black and Decker drill.
This Lint Eater cleaned my dryer vent and saved me a lot of money in the process.  Now the clothes get dry fast and the wife is quite happy.