Product review (5 stars): Excellent!
Works better than expected. The rods are flexible enough. And the brush is just right for removing lint.

As others have said, it is best if you can access both ends of the pipe as all the loosened lint piles up in front of the brush as you go and needs to be removed.  For the short section going outside, I used a shopvac to clean out the lint ball rather than remove the plastic cover outside. It worked great.