IMO a banneton is definitely worth it; it just takes a little while to season (I don't wash it between uses - just shake the loose flour off and let it air out).
Just wanted to say thanks for this advice - I tried it out this Sunday and it worked brilliantly; first time I've ever managed to get the dough in the casserole dish without ANY sticking. The pattern it puts in the bread is very beautiful too.
IMO a banneton is definitely worth it; it just takes a little while to season (I don't wash it between uses - just shake the loose flour off and let it air out).