Product review (5 stars): Worth the money
I purchased this kit plus extensions to clean a completely clogged up 30ft long duct. After running the clog removal tool and removing a couple of heavily compacted lint and hair balls I ran the bristle though the duct and removed like one grocery bag worth of lint and loose debris.
Now the dryer will work..before it won't even heat the clothes because of some fire prevention interlock on the dryer was activated by the obstruction.
My only complaint is that the last rod broke but I have to  concede that I was running quite a bit of torque at that moment because of how compact the clog was.
All in all a recommended tool just make sure to use the clog removal tool first because the cleaning bristle is not intended to be used as a clog remover.