I received this product yesterday and used it today, about two hours ago. I don't write Amazon product reviews often, but this one is very good. In about 90 minutes including set up and clean up, I cleaned my double wall 30 foot (10 m) chimney liner. It worked so well, that not much additional sooted creosote was coming down as I worked it back down the chimney to disassemble the rods. On the way up, about two lunch bags of soot and creosote built up in my wood stove. The rods are sturdy, yet flexible, and easy to handle. The system comes with gloves, eye protector, a chuck for drill attachment, and a tool to push the spring-loaded balls to disassemble the rods (not really needed if you hae a moderately strong hand). The stiff nylon 'tines' were barely worn after its use. I am very pleased with this product and I saved money compared to one appointment with a chimney sweep. This product will work best with a circular flue liner or double walled pipe, maybe not as effectively with a rectangular flue.