Pyrex glass can be placed in a oven, used to store things in a fridge and it can be used in a freezer. The best thing as far as I am concerned is baking in these dishes. These come in a wide array of sizes and make a wonderful gift for brides to be. Performance Everything from casseroles to cakes can be prepared in these pans. If you need to take a covered dish to a pot luck these pans always look new and inviting or if you have food left and want to store it, the seal tight, leak proof lids makes storage of food easy. They are reasonable priced, stay new looking. Ease of Cleaning The glass containers are over-safe, they don't warp, stain or absorb odors. and the lids are microwaveable and can be placed on the top shelf of dishwashers.. Durability They are reasonably priced, They don't rust like the metal pans, they stay new looking, and they make food look more appetizing. They come in all different sizes, shapes. Design These baking dishes are available in so many different sizes and shapes. I love that they continue to look new. and because the heat is distributed, everything cooked in them browns evenly. Doesn't Stick I use a pre-cooking spray on the glass dishes that I am baking in just like I would a metal pan. These pans are so easy to clean. Hot soapy water and clean up is a breeze.