Product review (4 stars): Aluminum tubing yes, white plastic stuff - not so much.
It was not the fault of the kit, but the brush ripped right through my duct tube.  My tubing was the plastic material type and it was severely compacted.  It really wasn't very good quality.

Since then, I replaced the duct work with the aluminum variety.  I use this every month, which is probably overkill, but after not cleaning the ductwork in 15+ years (us and original owners) I feel like we are lucky we never had a fire.

It is simple to use.  Experiment with it on your drill first, I believe mine was in reverse the first time and so all the connected pieces actually unscrewed from themselves.  With the aluminum ductwork this is a breeze.  With the plastic variety, it did not work well for me.  We also invested in a vacuum attachment to clean out the dryer itself, because that was crazy bad too.