Yes I do cook., but its not a traditional clay tagine. It is a French take on the Moroccan original. The base is cast iron & the top is glazed earthenware. I have an genuine traditional too, but I prefer to use the french one as it stands up to stove top use far better. Besides, its not red
The clay base on the original is better on a charcoal fire than a gas or electric stove (though I have seen them so used). The original does a slightly better job though, if you go to the trouble of pre-soaking it, and using a charcoal fire.
I use it for Tagines (of course!), curries, and increasingly for European style casseroles.
The mistake most people make is to use it in the oven. Used like that, it is no better than any casserole dish. On the stove top, as intended, the upper part stays (relatively) cool so the evaporated moisture re-condenses & drips back into the dish, resulting in a moister and tenderer (???) meal.
Edit: In Canberra, I live in student digs. I bring a wok, a tagine & a French cooks knife. These allow me to do about 90% of my cooking. (Ever seen pasta cooked in a wok?)