Before purchasing a proprietary EMR solution, ask your vendor if you will require a special password in order to extract, into a generic format, your full and complete demographic and medical record data.
Ask that vendor if that special password changes on a regular basis, thus requiring you to maintain a monthly support contract with them in perpetuity.
Then ask yourself if this level of vendor lockdown is what you really want.
OSCAR is a fully open platform. Your data is, and always will remain to be, your data.