Product review (5 stars): Life saver!
This baby is a life saver. I used two, in order to help route the dryer exhaust vent on my LG Tromm washer/dryer. Construction is good quality and the outlet spins independent of the L part, which helps quite a bit. I ended up riveting one to the <a href=http://www.amazon.com/gp/product/B0028BAAWW/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1>Dryer Dock Quick disconnect, which is also sold via Amazon.</a>

Once attached together, this gave a handy, 90 degree quick disconnect from the wall. The fact that the outlet can turn from the housing, also aids in taking off problematic rotational torque from the hose, which can pop the quick disconnect back open. Definitely check out the quick disconnect as well as this item; you'll probably need two 90 degree elbows, by the way, as you often need to turn at the dryer outlet as well as the wall inlet.

Another handy item to have during install is some good quality aluminum foil vent tape, from either amazon or a local hardware store.

Overall, this item is very well thought out from a design standpoint and really helps when it comes to tucking the dryer back closer to the wall. Using this item I was able to get my stacked washer * dryer much closer to the wall (about 4 3/4 to 5 inches) and had far fewer issues with crushing hoses and kinks, etc.