They changed the process in the 80s to make it cheaper/more energy efficient. The article was in last month's CR. I read it at the library, so I can't quote from it. I used to loooove my pyrex too. I bought a nice, heavy, professional 13x9 metal pan, I hope it lasts me a long time. My 13x9 pyrex had a chip in the handle that I hadn't really thought much about, but that can be dangerous. If you want to use it, just be very careful and I would read the article so you know what to avoid. I also would always cut my cake with a metal knife because I didn't know any better. I also wouldn't think 2x about basting something while it's cooking, but that's a no-no too. It's just a matter of being careful and I don't know that I want to treat my cookware with kid gloves.