Product review (5 stars): Even good for cleaning long vents
Bought a house two years back and have always wanted to clean out the dryer vent since it seems to be a pretty long run. I could have paid someone, but I figured I would give it a shot myself. I followed the directions and took it slow. I used plyers to lock down each pole and didn't over do it on the speed of the drill. The vent attachment for a shop vac was really convenient and helped me have almost no mess.

I was able to get it to a point but there must have been another sharp turn and I didn't want to force it, so I backed the entire pole system out and then went into the vent from the other direction. Because of this I only used the rods that came with the kit and not the extension rods, so if you have a long run you might not need the extension kit, instead clean the vent from both ends.
I would recommend this system to anyone who wants to clean out their dryer vents, just take your time.