Customer Rating: 
Summary: Fine for Baking, as Intended.
Comment: This dish, and other glass ones like it, are for baking (casseroles, brownies, lasagna, etc.) and Pyrex serves this purpose just fine. But it is not intended for roasting, 400+ degrees, or direct conduction of heat!
Unlike steel, cast iron or (especially!) aluminum, glass is a thermal insulator. Therefore directly applying heat/cold (like burner flame) results in disparate temperatures across the material. Since heat is just molecular vibration, the temp. difference means the dish is vibrating "against" itself at different speeds.
Many of the reviewers complaining about dish "explosions" have discovered this the hard way. Of the current 21 reviews, there are two cases of attempting to make gravy on a burner, one roasting beef at 475 degrees, one roasting Thanksgiving turkey, and one transferring pork roased at 425 to a "warm" burner. It should be very easy for anyone to destroy whatever glass dish with similar techniques... as I did, many years ago in my mother's kitchen! Surely legitimate flaws attributable to Pyrex do exist, but flaws revealed during unintended use are a different matter.
