Product review (5 stars): This actually works!!!
I love it when something actually does what it's supposed to do.

There was a shocking amount of dusty grey fluff in the dryer vent pipeline and once cleaned, my dryer works much better.

Since the dryer is in the basement and the vent is at ground level, the long vertical pipes were a pain to get to and originally wired together. I went to the hardware store and got a flexible (but not floppy) dryer hose that has big plastic quick connect fittings on each end. I used it to replace the one visible portion of the vertical vent pipe. The flexible brush handles definitely need to be taped per instructions- but so easy to use, I didn't even bother with the drill.

Now I can open up the vent line for cleaning in both directions whenever needed and it will be a snap.