Very interesting thread! The Tattler lids might be just what I'm looking for.
For the people wondering about knowing if glass lids are sealed, it is no more difficult than metal lids. I check mine (metal bail "le parfait") by opening the metal clasp after 24 hours and giving the lid a good tug, just like I do with the mason jars. The metal lid's pop is satisfying, but no guarantee as I've had lids that were indented but only lightly (and temporarily) sealed.
I would *love* to switch to Weck jars but will have to win the lottery first