Product review (4 stars): Much better quality than the ones found in big box stores
This is a better item than the one I found at Home Depot albiet it is much more expensive.  The metal seems thicker and it is more solidly constructed.  I was willing to spend the extra $ because this is like a once every 10-15 year purchase, I would say.  I did have to seal all the gaps with the HVAC duct foil tape.  Working great for my dryer which is offset from the vent pipe in my wall by about 5-6".  After you set the length you should trim away the excess metal or it will look dorky, the seam will be harder to tape/seal up and it may limit how close you can get to the wall depending on the design of your dryer back there.