Product review (4 stars): Effective, but quite a workout...
The rods screw together pretty easily and the brush did a great job of cleaning, but the rods are too stiff to smoothly make it around any bend under about 1ft radius. They also have a definite grain to them and prefer to bend in one direction, this means having to force them to rotate against their natural curve. Without much to grab on to, it got pretty hard to twist once you rounded a corner.