Product review (4 stars): Worth it for preventing dryer overheating and potential fires
My husband had this together in just a few minutes and ready to go. While we were not able to use on the dryer vent side indoors (t's a stacked w/d that one person can't move out), we used it from the outside vent and got quite a bit of old lint. I'd give it 5 stars if it came with just one more extension rod. Even so, we were able to reach nearly all the vent length.  Towards the end, we switched out the long brush for the wider, shorter rotary brush. That really broke loose some material, including an old leash that the shop vac sucked up. No idea how that got in our vent, but I'm glad it's out! It seems the dryer dries a little faster since the cleaning. Given that professional cleanings were quoting $130, I feel the Lint Eater was a good investment.