Product review (4 stars): Make Your Wife Happy
My wife had been complaining (and probably running up our electric bill significantly) for the last few months about it taking 3 cycles to dry towels.

We've got the most bizarre dryer vent around.  It goes down in the laundry room floor for 3 feet, then under the slab foundation for 18 feet, then back up in the exterior wall for 4 feet where it exits in the brick outside.  She called around and was quoted $150-200 for a duct company to come out and clean our dryer vent.  I immediately started searching for a better way and discovered this product and ordered it, along with the extensions.

Following the instructions, I hooked up my vacuum inside while trying to go outside with the brush, extension and drill.  The unit made the first 90degree turn easily to go down 4 feet, but unfortunately, could not make the second 90degree turn to continue under the slab.  I actually twisted up my second rod and ruined one segment.  Regrouping, I instead took my leaf blower/vac and duct taped the vacuum side of it to the vent outside.  Going inside, I inserted the rod and brush and stretched down with my arm to make the first 90degree turn below the laundry room with my arm.  From there I continued adding segments cleaning towards the outside until I reached that last 90 turn in the exterior wall.  I knew I could go no further so accepted it as done.  I also used the thinner brush to clean inside the dryer itself as far as it would reach and pulled out a lot...a lot of lint.

My shop vac did not have the same hose size as the attachment that came with the unit so I had to re-engineer the connection using duct tape to get a tight fit, but then found that my leaf vac had much more suction power and opted to use it instead, in my own configuration, not exactly matching anything they suggested in their book or DVD.  The DVD accompanying the product is actually very clear with recommended alternatives.

Irregardless of my difficulties due to the insane duct design, my wife did a huge load of towels and wow, it made all the difference.  One cycle and dry!  And you wouldn't believe what was sucked out of the duct!!!

It's amazing what can make a wife happy these days!