1. Do I disable Google Sync services (gmail, cal, and contacts) and replace it with Flock?
2. Is my contact list and cal events empty until I enter a password to unlock them?
1. You can replace your Google sync account with Flock if you choose. You can import data from a Google account into your Flock account without destroying or altering the data in your Google account.
2. The Flock encryption is used for transmitting data to/from the server. On the device, we let the Android permission system take over from there, so you don't have to enter a password in order to see your contact or calendar items. Your workflow remains the same as before.
I will definitely pay for this, if it works well. Contacts and calendar sync are very important to me, and nothing else does it as well as Google, right now (as far as I know).
Feature request: Please support contact checkpoints. Some app accidentally deleted all my contacts once, and the only thing that saved me was Google's "restore contacts as they were X time ago" feature.