Top positive review
Here's why you should buy Pyrex and not knockoffs...
Reviewed in the United States on March 25, 2019
I have terrible stories of ruined food from microwaving it under Martha Stewart lids. Those knockoffs melted quickly and made me pretty mad. still more of the Martha Stewart lids also deformed in the dishwasher to the point where they won't stay on the glass containers. The Martha Stewart lids also cracked when frozen!
All three of the aforementioned problems don't happen with these genuine Pyrex branded lids, despite exposing them to more uses, a colder deep-freezer, and more heat (from longer run times in the nuker). These actual Pyrex branded lids cost more but it's "buy once, cry once". You never have to buy them again so long as they don't get lost.