Michael, I don't know if you've ever even looked at Milkman's Google Games/Game Center ANEs, but there is no need for "data structures" or "conversion utilities" in utilizing them. The only unique data structures used by either ANEs are the events, which are trivial to deal with. Displaying a leaderboard is a single function call. I really can't imagine anyone having to refactor to transition from one to the other.
Again, it's fine to focus on the planned merits of your product, but making up complaints about your competitors is unprofessional.
omrill, Vitapoly's ANE is iOS-only but it is still enough to prove that Michael's claim about being the first to have turn-based multiplayer to be blatantly false: "Additionally, we are planning to be the first extension to provide turn-based multiplayerfunctionality through the game services."