I don't mean to sound like a devils advocate, but perhaps a lot of people are attempting to squeeze the bags far harder than the water flow rate allows for, if even other bags are failing. In my limited use of the Squeeze I've found no real flow gain past a gentle squeeze, and even that is only about 25% greater than just letting it gravity flow. Perhaps people's expectation of flow through the Squeeze is too high.
While I've only used mine about 8 times now, I haven't even had a problem with the original Sawyer bags. Not doubting that the Sawyer bags aren't really well made, because they simply FEEL cheap to me...but perhaps closer observation of flow rate gained at different pressure rates would explain a lot. If you squeeze anything harder than the restriction being imposed on said object....it's bound to rupture in some way.
...just sayin' IMHO.