An honest entry: this is the heaviest item on the page and it is the wrong choice for anything carried on your back. For a van, a boat, a car boot or a house, it is the best cooking vessel here by a distance.
What it does that nothing else does is hold heat through a long slow cook without a controllable flame underneath. Set into embers, or on a charcoal barbecue with the lid on, it will do a two-hour braise that no camping burner can hold steady. It is also the vessel for bread, which is otherwise off the menu without an oven.
For the household case it earns its place differently. In a power cut it works on any heat source you have, including a wood burner, which is not true of anything with a plastic handle or a non-ferrous base.
Enamelled or bare are both fine. Bare needs seasoning and drying; enamelled does not, and is easier if it lives somewhere damp. Neither likes a sharp temperature shock, so do not fill a hot one with cold water.
A lid that takes coals on top is what makes it a real oven rather than a heavy pot. Flat-topped camp ovens are designed for this; a domestic casserole lid is not.