You're right that trials should be represented as a first-class concept in the App Store, but right now the best solution is already fairly elegant: in-app purc

You're right that trials should be represented as a first-class concept in the App Store, but right now the best solution is already fairly elegant: in-app purchases for free apps. That lets you sell the upgrade to the full version from inside the trial version, and avoids any issues with data migration.