"True.  Although for a mason jar style with a seal lid and a threaded ring, I don't see how poking a hole in the seal would make the ring any easier to remove, since the forces would be friction on the threading not due to pressure differential inside the jar."

"You can break the seal without puncturing the lid using this:http://www.brixdesign.com/388/jarkey-jar-openerIt's very small and requires minimal effort to use.  Plus just a single piece, no moving parts, I think would last much longer than a POPit"