Product review (5 stars): I was skeptical it would actually work but it worked great!
I had to buy two kits to get the needed length but this kit worked as advertised. Needed 7 rods to get all the way to the end. I used a shop vac and drill and cleaned from the inside. My duct is metal all the way and I have a 90 degree bend only 2 ft after the duct starts. I thought no way is this thing going to make it around that corner but it did, no problem! Tons of old lint that looked like grey cottage cheese came out. I then used an electric leaf blower for that final clean out. The kit contains everything you need except a drill, shop vacuum,  simple hand tools to tighten the joints and duct tape to seal the joints. I did not have any issues with the rods breaking like other people have reported. Keep the drill speed low and always Turing clockwise and you will be fine.

Totally satisfied, highly recommended.