Product review (1 stars): Not worth the trouble
Yes, I hate this thing! It is now living with soda cans in the recycling bin at the local landfill. It is a real pain to deal with removing the baffles as you will see if you need only a 0 - 19" extension. It is a struggle to get this all lined up and secure. Keep in mind with this unit on your dryer, you will not simply be able to move the dryer out of its spot unless you take off one clamp. After I finally got everything cut, taped (yes it will allow air to escape into you house unless you seal it up better) and in place, I discovered that it really didn't save me any noticeable space in comparison to my standard hookup in my setting.

It may work better for someone else's application.