Product review (4 stars): Good product that does the job needed.
We needed some vent extenders in our new house when we found that some of the vents were going to be underneath furniture. We read the reviews. These are light-weight plastic and they are not sturdy. However, they don't need to support any weight and we were placing them under furniture away from foot traffic. And the dimensions were right, and the price was right. This product got the best reviews of the ones available. We've had them in since we moved in last Spring. They do exactly what we need them to do--they channel the heat from from the floor vents out from under the furniture into the room. That prevents damage to the furniture and heats the room more effectively. They are a good product.