Product review (5 stars): My laundry room is on the 2nd floor so that was no easy task. I was still not getting the air ...
I have been dealing with a faulty dryer vent issue for a while and decided to permanently fix the problem.  First step was relocating the exhaust outlet.  The vent hose was over 20 feet and contained a few 90 degree turns. With careful planning and cutting through a different exterior wall, I was able to shorten the hose to 9'.  My laundry room is on the 2nd floor so that was no easy task.  I was still not getting the air flow I thought I should have.  The louvered exhaust was not opening up as much as I thought it should.  I followed the directions and used the LintEater.  I had a clog in the vent duct  and it was quickly removed!  The louvers now stand straight out when the dryer runs.

Directions are simple, but make sure you follow them.  Set the drill clutch at 1/2 setting or less.  The drill I used went to 16, so I set the clutch at 7.  If you run into any problems, the clutch will slip and not cause more problems!  Screw the rods together tightly with pliers and make sure the drill runs clockwise. You can also put tape over the joints.  If you don't know what clockwise is, put the drill down and get help.  Keep the brush spinning as you enter the duct and as you withdraw from it.  That's about it.  I had a shop vac ready so when I withdrew the brush all the lint got sucked in.  One more thing, remove the exhaust plate before you start. I ran the brush from the dryer side to the exhaust side.