Product review (4 stars): It works.
Just a few issues, but it works as expected.  The part to the wall is maybe just a tad too large.  I was able to get it to work, but I had to spend some time to get it to fit with the existing pipe.  Mine actually protruded out of the wall about 1 inch, so I cut into it perpendicular to the opening about every inch and bent it back.  That made it easier to slide in the wall piece.  Second issue is with the connection.  It just slides into place and has no type of lock system.  My dryer has a semi-rigid hose (the one pictured is not recommended due to heat).  When you push the dryer back into place it collapses the semi-rigid hose causing it to turn off the wall.  After a few attempts I was able to get it to work, but it took a while.

Still much better then it was.