Product review (5 stars): Great product for a clean, neat dryer exhaust run.
This worked very slick.  And, allowed for a clean, minimal length exhaust path.

My dryer goes straight back into what I think might be called an alcove.  Anyway, it has walls on both sides and only a few inches of clearance.  It has to be a straight shot for about 5 feet.  No way to get behind it to hook up the exhaust duct.  I could barely reach the gas hook-up with a 6 ft gas line connector.  If I did that with the exhaust flex line, you would end up with lots of bends, and maybe kinks.  This product allowed me a much cleaner final installation.  I used a close 90 from the wall, a short piece of 4" straight aluminum duct and used a 2x4 behind the magvent 90 for mounting and to space it out even with the duct from the close 90.  I attached the flex duct on the other magnet to the dryer with the supplied clamp and extended the connector out a bit to make sure it would reach the wall connector.  I slowly moved the dryer into position, looking over the top a couple of times to see how it was going.  Then, while moving back a little more, I heard it connect.  Double checked, and it look good.  Then I moved the dryer back a bit more as the flex duct retracted.

What a great idea.  Well worth the price.