Product review (5 stars): Works great
I have about a 20 ft run. It badly needed cleaning. This worked easily and quickly.

I hooked up a vacuum on the dryer end and came in through the vent side. Since it's only 12' I followed up by pushing it through from the dryer side then turning on the drill and drawing it towards me with the vacuum nozzle in the end by me also. (In essence pulling the remaing lint towards me with the vacuum sucking it up as it came)

An extension kit can also be purchased but this worked fine.

The other attachments worked well in the lint trap but I also took off the back to vacuum inside as much as possible. (If a fire starts in a dryer obviously it will start near the burner)

Good luck!