No studies, but the kinds of responses I’ve found most helpful are the ones from folks who have experience with particular products over the longterm — like, this is the place I go to figure out which Pyrex to buy if I need one that is over or freezer safe, or to check to see if Brand xyz is still putting out quality goods (many have changed their materials or moved their production in the recent past and quality may have suffered to a point where an item you might assume is BIFL isn’t anymore).