Layla, it doesn't address corning specifically, but the owners manual with my JennAir says not to use glass pots or pans - scratching the surface is possible.

My JennAir book also says never use a trivet or wok ring on the surface of the cooktop....

I have a glass top GE. It says no glass cookware

That's kind of strange to me that today's cooktops discourage the use of glass cookware . I remember when Corning introduced the first glass cooktop called the Counter That Cooks back in 1969. They were ranges and there was also a portable tabletop cooking surface. They took Corningware and advertised a line of it as being perfectly flat bottomed to use with the glass cooktops.

I am baffled by a lot today. For example people treating stainless like fine china instead of well, stainless. I still use SOS to keep my stainless clean and I still use it on my vintage Corningware that still looks new. Comet/Ajax cleanser too. ;-)

Somewhere I have a magazine that highlights Corning products of the time with recipes etc. I have to see if I can dig it out.

I have a complete vintage Pyrex 9 cup percolator that I now use mostly as a pitcher for my soymilk. The soymilk comes out of the machine quite hot, so it's the perfect container.

I've had the coffee pot for years, and while I never used it on a glass-top, when I used it on the old-style electric coil elements I just bent up one of the sturdier clothes hangers to make what they call a diffuser. If you do a search, you'll find a number of different diffuser styles. Some appear better for a glass-top than others. I think, that if this is something you would want to use often, the kind that look more like a splatter screen might be best, but I haven't read any of the descriptions on the ones I just looked at, I'm sure they would offer details.

If the manufacturer way back then (who I understand has closed the business) issued a recall and recommended the product shouldn't be used, why mess with it?