Product review (5 stars): Awesome gadget.
Saved me a hundred bucks per year from here on out!!! I needed to buy two units to get the length I needed, but that still saved me $50-60 this year. Is EASY to use. However you DO need to tape all of the joints (and I would *highly* recommend taping the head on as well), just in case you accidentally reverse your drill while you're working. Or if you let your kid help and they hit the wrong button (ask me how I know. LOL.) So seriously don't skip that step, I was really lucky I'd let my daughter 'help' while I was still close to the vent opening or we'd have lost the head in there forever. Great product though, super super easy to figure out and handled the 90 degree turns in the vent just fine!