Product review (5 stars): Buy this you'll probably love it. I LOVE MINE. CLOCKWISE ONLY or you'll unscrew sections inside the duct and you'll hate you!
My 30 year old dryer was taking hours to dry my clothes. Before the LintEater 30 mins in the dryer was only the warmup. Now, after using my $27 LintEater, 30 mins is the time I need to dry my clothes.
The hardest part of the lint cleaning job was pulling the dryer out and putting on a new silver accordion duct. In my case I had 14 feet of duct to clean out with this 12 foot kit so I turned the dryer on min heat to blow the air out. I connected the brush and 3 ft. extension to my drill, inserted into OUTSIDE vent, turn the drill CLOCK WISE, not too fast, and used in and out motion to pull the lint out. I screwed in each section adding duct tape just in case I accidently went insane and operated the drill counter clockwise and unscrewed one of the extensions inside the duct. Used the same in and out motion to get the lint out.  To clean the 2 feet I could not reach from outside I turned the dryer off, disconnected the accordion duct and cleaned the duct from the INSIDE of the house. I bought a new accordion duct and attached it to the dryer and vent.  Note I never cleaned the vent and I had 30 years of lint that I pulled out of there.

I love my new 30 year old dryer now.