Didn't see it actually linked, but
this is the kit I got
Pretty ingenious actually. You hook one end to the shop vac, and it has a hole through which the rod feeds. The vac attachment hooks right up and seals up the opening very well. The rod is very flexy. Easily handled a 45 degree and 90 degree bend. Using a drill to spin the brush, and adding sections as I went, I cleaned a pretty long run. The shop vac sucks it out as the brush breaks it up. It's cheap, and you only need to buy it once.
At least for my vent, I don't see how I could've gotten it clean with just airflow. The humidity causes the lint to almost cement to the sides. There's no way I could reach the entire length of the run.