One article mentions that the "inferior" Pyrex has a faint greenish tinge where the glass is the thickest.
Evidently the Chinese owned Pyrex is made in USA...this makes it very difficult to identify as "different". Corning sold the patent.
One article also mentions micro cracks that may develop which then absorb water, and then burst when heated. But that does not explain the bowls that burst sitting at room temp -- the water bowls for pets and the one that burst sitting in a cupboard!
I've used Visions on the stove now for almost 20 yrs...the only one that broke was the one my husband dropped a heavy thing into by accident, and it broke in half. But he knows a gal at work who claimed her Visions pot blew up on the stove cooking.
I typically use mine for stews, soups, and pasta. I'll pour out the hot liquid and leave on the gas stove burner to cool off. I don't move them to a counter, I leave them on the hot burner so that both can cool down together. When I stack them for storage I put bubble wrap between them. But I don't put bubble wrap in my Corelle bowls or smaller visions glass dishes when stacked which we use to nuke the veggies in the microwave. Those are really handy and never exploded on me. 2 minutes in the wave, doesn't seem stressful enough? Frozen veggies heated up and nothing explodes.