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Don't rule out Core Data! It's very nice (especially with the new concurrency APIs); it hasn't yet been brought totally up to speed with iCloud, but it's been improving every year. Remember that OS X is on annual releases now, so there will be more improvements this year and so on.

I wouldn't rule out core data just from this post. Core data may have some quirks, but it's pretty reliable and very useful from my experience. I haven't given iCloud + core data a try, since I wasn't sure if it were reliable yet.

We use Core Data all the time. In over 20 apps or so. We have no problems at all. It's a fantastic persistent storage API with some great features.

That said, I would not use it in conjunction with iCloud. That's where all the trouble is.