It performed well, I feel much safer now. Not worried about fire.

I have 17' of vent pipe from an upstairs laundry room to the outside of my house. There were also two 90 degree elbows involved. I fed the drill end of the shaft from the inside of the house, through the lint clog, until the end came out on the outside wall. Then I attached the drill (running clockwise) and pulled it through the vent pipe slowly. I was amazed at how much lint came out of that pipe! I had to do this about a dozen times until no more lint came out from the end of the brush. I was surprised that I was able to work the shaft around the 90 degree turns, but it worked.
The only change I would make to this product is to round over the drill attachment end, so it can work its way around the turns easier when you push it through the first time. I plan to do this the next time I clean my vent.
Although I haven't run my dryer yet, I'm anticipating that our clothes will dry a lot faster, since our dryer can now "breathe", and also the peace of mind that our home is a bit more fireproof than before.

used it on multiple dryer vents. just ran it thru a vent pipe with 2 - 90 degree elbows to clean out 20 years of lint in rental house. worked great. will buy 2nd set to make it longer.

I don't write many reviews, but I do when I feel there's value in adding my voice. In short, if you have a dryer that vents to the roof or has a long run to wherever it vents, I urge you to get this tool (or something like it) and clean the vent pipe. I was shocked at the amount of lint I pulled out of my pipe this morning.

Why is this important? If your dryer can't breathe well, it can cause excessive heat build-up which of course is a fire hazard. Second, the better your dryer can breathe, the more efficient it will be. Shorter drying times and less energy used. This became plainly obvious after watching a number of YouTube videos on the subject.

This device pulled at least one half cubic foot of lint out of my pipe (I cleaned out my shop vac before and after to get an idea). The cleaning procedure is best done with a drill to turn the rod (the kit comes with an adapter that secures into the drill chuck) and someone to operate the drill while you feed the brush and rod assembly up into the pipe. Have a vacuum cleaner standing by (preferably a shop vac) to clean up the mess as it comes out.

You probably won't need to assemble all 20 feet of the rods, but at least 8-12 feet. Make a couple of passes to get everything out. And wear a mask - the old caked-on lint is very irritating to your nose and sinuses. Don't forget to clean the lint out of the flex pipe that runs to the fixed pipe, and the area where you insert your lint trap. You will likely need additional tools for the latter.

If your place is more than a few years old, and you've never done this (or had it done) spend a few bucks, set aside 30 minutes, and get it done. You will be glad you did.

Did have one of the pieces come apart at the crimped metal end while using it. Had to retrieve the brush and other extension pieces out of my dryer vent duct work.