Product review (5 stars): A must have for every homeowner.
We built our home almost six years ago and the dryer vent had never been cleaned.  I though all I had to do was clean the lint filter every time and all would be well.  The volume of lint I removed (uncompressed) was probably more than a 5-gallon bucket worth.  This cut drying times in half instantly.  I have a roof vented system with about a 15 foot vertical climb so I had to get the extender kit (this one will give you 12 foot).

My only complaint would be that the shop vac adapter is the 2 1/2" variety whereas my smaller shop vac only has the 1 1/2" hose.  Duck Tape is your friend with this kit.  The mfr said the larger opening was necessary so as to prevent clogging but I had no problems with the smaller sized hose.

Bottom line-better get one.  I'm lucky I did not have a dryer fire.