Product review (5 stars): This thing actually works as intented
Had my doubts when I ordered it, since it's all plastic, but it really works to connect your dryer vent to the wall or floor, and it makes it really easy to disconnect and reconnect for cleaning.  One suggestion: twist the hose end about half a turn (or more if your hose is very flexible) in the "open" direction before snapping the halves together.  This creates a twisting force in the "closed" direction to keep the connector from opening when you slide your dryer back in place.