Product review (4 stars): not good. And be sure to duct tape your screwed ...
This device works very well...one word of caution if you use a cordless drill: use the clutch setting at low so the drill will slip if it binds vs continuing to spin and twisting an end off of one of the attached rods ( happened to me ). Luckily I had purchased two sets of rods so not a huge deal but you could end up spinning the plastic rod off of its end and leaving it in the vent pipe...not good. And be sure to duct tape your screwed rods together so they don't come unscrewed in the pipe as well. I would buy this again.