Product review (5 stars): Solid, works well.
Most of the heat keepers out there are made by Deflecto and sold under different brand names.  After I got tired of putting mine back together (extremely flimsy and fell apart every use) I tossed it and bought this one.  It is solid, works very well.  I did use metal screw clamps instead of the plastic ties that came with the product, but that was because I had some.  I assume that the plastic ties would work just as well.
Happy with the product.