Product review (5 stars): Problem Solved
Our dryer vent goes down 2 feet into the concrete slab then makes a 90 degree turn, goes another 5 or 6 feet and makes another 90 degree turn and then goes about 15 feet out to the side of our home.  I have a manual vent brush with a flexible shaft which cleaned the long run well from the outside, but it could not make the turn from the inside to the five to six foot run in the middle.  Clothes weren't drying quickly.  Towels would take two or more cycles.

I bought this with the hope that the auger brush could make the turn - did it ever.  I estimate that we extracted four gallons on lint from the pipe.  Clothes dry in one cycle!

I highly recommend this product.