My local appliance dealer says that the new appliances are designed to last for 10 years. That being said, I've used cast iron on my glass cooktop for at least 9 years almost every day. No problems and I have a variety of pans including a 16 inch cast iron pan and a griddle that uses two burners and the bridge burner. I am moving and have a new GE glass top. I intend to continue using cast iron. Just be careful and don't slide or twist your pans and in my honest opinion you'll be okay.
No, it will make clean up a very big job. I tried it, and it took a long time to clean the stove. I got an electric hot plate to use with cast iron. I use the cast iron to bake with. It does a very good job. (09/10/2009)
I use mine all the time, with no problems. Clean-up is no harder than with my regular cookware. You just have to be careful not to drop the pan/skillet since it is so heavy. And you have to pick it up and not slide it to another burner or it may scratch the cook-top. (09/14/2009)
I love my white ceramic stove top. It's easy and cheap to keep clean. Good old Comet, Ajax, or your favorite scratch-free powder bleach. Use a wet dish rag or sponge, wet soiled area, shake cleanser on those same areas, work around to a paste, let it sit, or work on it until it is clean! Anything left behind can be removed with a razor blade. (01/31/2010)
People do it, but the manufacturer says, no. You might get away with it, but you might crack your stove top as my son has done twice. This is why I don't like those stove tops. My son says the best thing to do is hit them with a sledge hammer right before the warranty goes out, but he was kidding of course. (06/24/2010)