Product review (4 stars): Good product, works as advertised
My old dryer damper was just a flap that had literally seized up in a permanently open position. As a result, the laundry room was always freezing. I replaced it with this dryer vent and the laundry room is as warm as every other room in the house now.

This product is well made, with good-quality plastic and thickness. It's easy to clean out, and there are no mechanical parts that can wear out or break down. The only down side is that to install it on my cedar-sided house, I had to remove 4 rows of cedar siding--the reason is that the siding doesn't offer the vertical surface that is required to install this item.  I like to have the siding flush against the round tube (covering the mounting plates) and a result it's quite difficult to install all the siding to fit properly.

Note the size of the item you are purchasing, I was surprised to see how big it is, and depending on the location of your dryer vent, this may be an eyesore.  In our case it's installed on the back of the house, in an inside corner, near the ground, so it did not matter.