Product review (5 stars): Absolute must buy! There can be A LOT of lint hiding in your vents.
I didn't know I was missing that much lint. I had always cleaned lint from inside the dryer, at the wall and outside if I could reach it. I wasn't doing it frequently enough (about every 2 years) but hadn't gotten so much lint out to concern me. I figured the lint catcher in the dryer must be doing a good job. Boy was I wrong. On first use in a new house (new to us but 15 years old) I filled up half of my shop vac with lint using this tool!

It's easy to put together and I did follow the recommendation to tighten each rod with pliers and cover with electrical tape. They stayed connected securely. The manual says it's important not to run your drill counter clockwise or you could lose a rod in your vent....I didn't test that claim. The brush has firm bristles but did squeeze through the permanent grill on the outside of my vent (to keep out critters). It's really a necessary tool.