Product review (5 stars): Works well and quickly
I bought this kit and a set of extension rods to clean a 30' dryer vent.  It worked well.

If you accidentally run your power drill in reverse, the sections will tend to unscrew from one-another.  Gardus recommends that you put masking tape over the threaded joints to prevent that possibility. If you don't and that happens, you could strand a section in the vent pipe. In that case, it will be you that's screwed, so better to tape the joints.

I found the taping and (more-so) the un-taping to be a bit of a nuisance.  However, given that it's unlikely that I'll be using this setup more often than once every two years, it is difficult to justify more complex fastenings.