My experience with Core Data and CloudKit has been very positive. I have an existing app which uses Core Data + iCloud, but it's time to redo it.
I created an app for simulation, dragged my app's core data model into it and examined the result when I enabled the schema. I had to make all of my atrirbutes optional. I allso cleaned it up and slimmed it down up deleting some entities that I wasn't using. I got the message that the result was successful. Then I saved some core data onto the simulated app and opened the simulator for another device. I got the data back from the cloud. So, I'm syncing.
It was pretty simple.
The harder part will be to go thru the history and find changes related to my view.
