Product review (4 stars): Easy To Use...Follow the Instructions
Instructions are detailed and the system will work if followed. I read other reviews about the rods snapping. I don't know how much torque or speed they used but suspect they did not follow the instructions. It has been 5 years since the dryer vent was cleaned.  I first used my leaf blower inside at the wall connection which did blow out a large amount of debris.  From outside of the house, I used a Ridgid clutch drill set on low speed and clutch at the 12 setting. I also had my shop vac hose inserted from outside also.  It did bind so I backed out about 6 inches while still running and then move back in and the rods did eventually make up to the wall connector. I used all 4 rods for about a 10 foot run. I ran through twice and it removed all the debris. For peace of mind, I wrapped duct tape around each screw connector and the rod in case they separated. I did not wrap around where the rods screw together since as long as the drill stays rotating clockwise, the rods cannot unscrew. One Con:  the lint brush and screw connector were loose but not falling apart. I did secure with a few drops of Gorilla Glue. Take your time using and youll be impressed with the improvement in dryer efficiency.