I have never owned a piece of Le Creuset before though I've known of their reputation for a long time. I've now used the 2 qt dish several times for casseroles and it's the perfect size and the food cooks very evenly in it. I love the fact that the dish is attractive enough to go from oven to table.
I haven't found a use for the smaller dish yet, maybe a veggie/cheese dip?
One thing to note, the 2 qt dish is perfect size for things like sheppard's pie, mac and cheese, ratatouille, etc. not a whole roast. You would need at least a 4 qt dish for that.