Every serious chef uses his or her Dutch oven constantly, and probably cast-iron skillets of every size too. Lodge Logic has supreme quality products and they are a fraction of the cost of the French Le Creuset line.
Treat it right, and cast iron cookware will last you a lifetime. Literally. In fact, you really can't ruin it forever; it might take a little elbow grease and some patience, but there's always a way to bring it back to life. The real key to making cast iron stand the test of time (and cooking) is knowing the best ways to clean and maintain it.