We use really heavy duty, non-stick ones. They're pretty good quality ones, but I can't remember the brand name (anyway, they're probably different in the US). I never put them in the dishwasher and never use metal utensils on them.

We bake a lot and they seem to hold up pretty well. If DH is making a very wet dough, or I'm making sticky cake we may well grease or line them, even though they're non-stick, just so there's no danger of sticking, getting frustrated and attacking them with a sharp knife!

Zillah