I don't believe it matters what you use to cook food in a microwave oven - they're dangerous and alter the foods composition regardless. So even the safest cookware won't prevent microwaved foods from becoming toxic. I know microwaves are a great convenience to a lot of people, but sometimes convenience comes at a price.
Ultimately it's each individuals choice on how they wish to prepare their meals - but I made conscious decision to throw away mine a few years ago. There's enough electromagnetic pollution around me that I have no control of.