Product review (5 stars): but it worked like a charm
I was a bit skeptical at first, but it worked like a charm. I have a very long run of about 27 feet or so even with an additional set of rods I had to go in from both ends. So I did 24' from the outside and then went in from the inside. I was concerned with a 90 degree elbow that is on the inside end. But the rods were flexible enough to go in once I started the spinning.

My dryer was taking two hours two dry our  clothes. Now 40 minutes is enough!

Do a price search... I got it for less that 23. I wish Amazon had a price match policy.