For what it's worth, the company I work for is bringing in 'variable' roster for all new starts and hoping to phase out 6/3.
Now, I work in crewing/ops and the 'variable' roster makes our jobs a damned sight easier. Not much use you guys hearing that, but, from a management perspective (and I'm not management) I can see why it's being done.
I believe that Easy use the same rostering system that we do. Good luck !