Product review (5 stars): Worth it.
Installs cleanly, and relatively easy.  I ordered two, as I have a 90 degree turn from the wall, then a short length of hose, then the 90 degree turn into the dryer.  The dryer attachment was super easy to install, the adapter just fit perfectly.  The wall side needed to be crimped a tiny bit so that the Snap to Vent could fit over it.  Bending a small V shape into the metal vent pipe fixed the issue, and the adapter attached perfectly. I am very pleased with the product.  It allowed me to gain a little bit of space, but it also will make it easier to clean the lint out of my dryer, as well as make the house safe by avoiding the vent to be crushed.