Just opened a few of the new bottles, a Cooper's Canadian Blond. Must say I'm impressed, certaintly no loss of CO2.
And heres an interesting side effect . . . I somehow forgot to prime a few of the bottles so I put carbonation drops in them. The first attempt was a disaster, the beer foamed all over the place. But from that point on, I managed to pop in a carbonation drop and close the cap without losing any foam or beer.