Product review (5 stars): Great in function, ok in material quality
The vent works very well. I installed one at our last house after a chipmunk entered our dryer vent from a flapper type vent; we've never had an issue since then.
I installed one of these about 10 years ago at our present house, and it lasted until I hit it with a snow shovel and it shattered. I installed this new one and it fits up to the old holes exactly. It holds up pretty well, but the material is fairly brittle and you need to be gentle when tightening up the mounting screws.