Product review (5 stars): This worked great. After reading reviews and the directions
This worked great. After reading reviews and the directions, we followed them explicitly, particularly making sure we did not put the drill in reverse, so it wouldn't unscrew the brush while in the duct. There were 3 birds nests in the duct - one of which was active - unfortunately the babies startled me so I flung the nest on the ground from the ladder I was standing on - and they didn't make it. There was a bunch of lint backed up behind the nests.  Now instead of taking over an hour to dry my laundry, it's done in 40-50 minutes. And the best part is - we can use it when needed. We did rig up a wire guard to keep birds out in future, but I imagine we'll still need to clean out accumulated lint periodically. Definitely worth the small investment rather than paying someone to come clean it.