Product review (5 stars): A great device that has my dryer working well again. Simple instructions here.
I bought this last October and finally got around to cleaning our 15-foot dryer duct run. It's just not the type of thing that's at the top of your list... like "Wow, should I go see a movie, or clean our dryer duct?" However, our dryer was drying slower and slower, and I knew it was a task that I needed to tackle, so I read the very long instruction book for this and began my work. The instructions really need to be re-written and simplified. My Sony TV has a smaller instruction manual. But I do appreciate the manufacturer's thoroughness. For those of you with short attention spans here's my quick start guide:

1. Screw the rods together and use electrical or duct tape to reinforce the joints to keep them from unscrewing during your work.
2. Stick one end of rod in your drill and set the clutch pretty close to the lowest or second lowest setting, then increase power if you need it.
3. Attached brush to other end of rod with supplied key wrench / allen wrench and tighten.
4. Make sure your drill is on clockwise - not reverse - mode or else the rods will unscrew inside your duct and you're screwed.
5. Read #4 again.
6. Turn dryer on air mode and then insert the brush in the pipe outside and begin spinning it by activating the drill. Push it in about a foot, then pull it out and watch the lint fly. Then push it in 2 feet and pull it out and watch the lint fly. Then 3 feet... etc.
7. Marvel at how much lint came out.
8. Marvel at how fast your dryer is and come write a review here.
9. Wash the clothes you were wearing when you did this because they are now covered in lint.

Hope this helps. It's a quick job and well worth it the trouble!