Product review (5 stars): IT WORKS!
So glad I bought this.  A few days ago, I washed and dried some white sheets.  When I took them out of the drier to put back on the bed, I saw something that looked like dried mud on the sheets.  Weird, I thought.  Rinsed them out, dried them again, went to put them back on the bed, and MORE "mud".  Did a quick Google search and read that my drier vents were probably clogged and were a fire hazard.

I was about to call a repairman to come "fix" my drier, but after looking on Amazon, I found this product and decided to purchase it.  (Yay for Prime 2-day shipping.)  It arrived on Sunday, and I put it together and inserted into the outside vent opening.  I didn't actually use the drill, because the battery was dead.  After getting some lint out (not a huge amount), I went inside and tried the same thing from where the vent goes through the floor and under the house.  I felt like it got stuck on one of the bends, so I went outside and tried it from the outside again.  Same result.  At that point I went in and turned on the drier, but this time there was no air coming out the vent.

I figured I had somehow disconnect the vent under the house, so my husband (lucky guy) got to crawl under the house and see what I had done.  I had, in fact, disconnected a joint in the vent, so he fixed that, but when he crawled out, he brought a HUGE pile of lint.  I think I had jammed it into an elbow of the vent.  Maybe if I had used the drill it wouldn't have done that, but, oh well - no real harm done.

I then cleaned out the back of the drier and got a good amount of lint and used the long brush to clean out the slot where the filter goes.

Turned the drier back on and YAY  - it works!  Bottom line, is that towels that used to take over an hour to dry now take about 40 minutes, and I don't have to worry about burning down my 100 year old plus house down.

HIGHLY recommend this product.!