The glass is a totally safe material (we just have to be careful not to break it). Moreover, it is beautiful. So this baking dish has three main positive elements: You can use it not only for the baking but also for the freezing of your dishes, while if you want, you can -after they are prepared- serve them in it.
In this particular range, you can find two more round baking dishes in two different sizes, to choose the one that fits your needs.
A glass baking dish is necessary to every kitchen, especially when it is a baking dish that we can use not only in the oven but also in the refrigerator. I often use them just to serve some foods, e.g. my steamed vegetables. You can really make anything with a dish like this in your cupboard.