I've just gotten into Le Creuset. I bought mine second hand and in very good condition. I use the casserole pot at least once a week, more often two or three times. I bought the grillit skillit and use that once a week. Not my favourite piece, but nice makes nice grill marks. I also have three of their sauce pans. I would like to get a normal Le Creuset frying pan next and then all my major cookware will be by them.
So far, so good and I would recommend them. But, you can not stack them as it will scratch the enamel. The Grillit can be difficult to clean, unless you've built up patina. I generally heat up the kettle with boiling water and put it into Grillit just after I finish cooking, and by the time I'm finished eating, it's ready to be scrub (nylon brush).