Product review (5 stars): Works as expected
I bought this cleaning device after drying time became excessive and poking sticks into the vent tubing didn't help. It worked well and now I can dry towels again. The shop-vac attachment does not work exactly as the instructions imply if there is too much lint to pass through the openings (you will need to see the attachment to understand what I mean), but by alternately brushing and manually removing the lint, I got it all.  The device requires at least a 3/8" drill motor, which is a tight fit. A 1/2" drill motor would be a little better, although overkill in terms of power. I was quite amazed at the amount of lint in my 20-foot long vent tube.