We have a gas fireplace now that we've never used. It's in the basement, which used to be finished before we bought the house, but it's not exactly finished any longer. I think the home inspector said the lines need to be replaced, so I haven't even turned it on.
We had a regular fireplace at our apartment, which looked nice but was a complete waste of space. We burned one log in it one time and the entire place felt like a god damn oven for 2 days.